CN111442503A - Control method and device for outdoor fan of air conditioner and air conditioner - Google Patents
Control method and device for outdoor fan of air conditioner and air conditioner Download PDFInfo
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- CN111442503A CN111442503A CN202010271433.6A CN202010271433A CN111442503A CN 111442503 A CN111442503 A CN 111442503A CN 202010271433 A CN202010271433 A CN 202010271433A CN 111442503 A CN111442503 A CN 111442503A
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method and a control device of an air conditioner outdoor fan and an air conditioner, wherein the control method of the air conditioner outdoor fan comprises the following steps: acquiring an actual output temperature, wherein the actual output temperature is determined based on an inlet temperature of an indoor heat exchanger; acquiring a target output temperature; calculating a difference between the actual output temperature and the target output temperature; and controlling the rotating speed of the outdoor fan based on the difference value. The invention can realize the accurate and stable control of the outdoor fan, reduce the pressure difference fluctuation of the system and improve the comfort.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a control method and device for an outdoor fan of an air conditioner and the air conditioner.
Background
When the air conditioning system is used for refrigerating in a low-temperature environment, the pressure of the system is possibly too low under the influence of the ambient temperature, and the pressure of the air conditioning system needs to be specifically regulated and controlled to ensure the reliable operation of the air conditioning system.
In the prior art, the system pressure is simulated by using the temperature of the coil pipe of the outdoor heat exchanger, so that the rotating speed of an outdoor fan is controlled, and the system pressure difference is guaranteed to realize reliable operation. However, when the outdoor ambient temperature is lower than a certain value, the outdoor coil temperature is greatly influenced by the outdoor ambient temperature, and can be distorted, and the pressure condition of the air conditioning system can not be accurately represented, so that the control error of the rotating speed of the fan or the accurate control can not be realized, the pressure fluctuation of the air conditioning system is caused, the indoor outlet air temperature fluctuation is caused, or the icing condition of the indoor heat exchanger is caused.
Disclosure of Invention
The invention solves the problem that when the outdoor coil temperature is used for simulating the system pressure, the outdoor coil temperature is easily influenced and distorted by the outdoor environment temperature, so that the air conditioner cannot accurately control the rotating speed of an outdoor fan, and the air outlet temperature of the air conditioning system fluctuates or an indoor heat exchanger freezes.
In order to solve the above problems, the present invention provides a method for controlling an outdoor fan of an air conditioner, comprising:
acquiring an actual output temperature, wherein the actual output temperature is determined based on an inlet temperature of an indoor heat exchanger; acquiring a target output temperature; determining a difference between the actual output temperature and the target output temperature; and controlling the rotating speed of the outdoor fan based on the difference value.
The rotating speed of the outdoor fan is controlled through the actual output temperature, so that the high pressure and the low pressure of the air conditioning system are controlled, the actual output temperature is determined according to the inlet temperature of the indoor heat exchanger, the inlet temperature of the indoor heat exchanger is less influenced by the outdoor environment temperature, the control stability is higher, the rotating speed of the outdoor fan can be accurately controlled, the pressure fluctuation of the air conditioning system is avoided, the comfort is improved, the temperature sensing bulb can be arranged in the indoor heat exchanger for detection, the cost is lower, and the popularization and the use are easy; based on the difference between the actual output temperature and the target output temperature, whether the low pressure of the air conditioner is too low or not and whether the indoor heat exchanger has the risk of icing or not can be judged, and then how to control the rotating speed of the outdoor fan is determined, so that the air conditioner can run reliably.
Optionally, the obtaining the actual output temperature includes:
acquiring the current inlet temperature, the current middle temperature and the current outlet temperature of the indoor heat exchanger;
determining the actual output temperature based on the inlet temperature, the mid-section temperature, and the outlet temperature.
The dependence of air conditioner control on a single temperature value/temperature sensor is reduced, the fault tolerance is improved, the control of the outdoor fan is more accurate, and the running reliability of the air conditioner is improved.
Optionally, the determining the actual output temperature based on the inlet temperature, the mid temperature, and the outlet temperature comprises:
substituting the current inlet temperature, the current middle temperature and the current outlet temperature into a preset formula, and calculating to obtain the actual output temperature, wherein the preset formula is as follows:
t1 ═ T + TB + TC)/k, where T1 is the actual output temperature, TA is the inlet temperature, TB is the middle temperature, TC is the outlet temperature, and 3< k is not more than 3.5.
By enabling k to satisfy 3< k is less than or equal to 3.5, and k is greater than 3, the finally calculated actual output temperature is lower, the actual output temperature is closer to the inlet temperature, k is less than or equal to 3.5, the value finally calculated by the air conditioner does not deviate from the inlet temperature, and therefore the accuracy of the actual output temperature can be improved.
Optionally, the controlling the rotation speed of the outdoor fan based on the difference value includes:
when the difference value is smaller than or equal to a first preset temperature, controlling the rotating speed of the outdoor fan to reduce a preset amplitude;
after controlling the outdoor fan to operate at the current rotating speed for a preset time, judging whether the difference value is less than or equal to the first preset temperature;
and when the difference value is smaller than or equal to the first preset temperature, returning to the step of controlling the rotating speed of the outdoor fan to reduce the preset amplitude.
The appropriate rotating speed of the outdoor fan is determined by gradually reducing the outdoor grading rotating speed, and the control stability is ensured.
Optionally, the first preset temperature satisfies: t is more than or equal to-3 ℃ and less than or equal to-1 ℃, wherein T is the first preset temperature.
The pressure state of the air conditioner can be determined in time, the temperature of the indoor heat exchanger is improved, and the indoor heat exchanger is prevented from being frozen.
Optionally, the obtaining the target output temperature includes:
acquiring the current outdoor environment temperature, and acquiring the corresponding relation between the preset outdoor environment temperature and the target output temperature; and determining a target output temperature corresponding to the current outdoor environment temperature based on the corresponding relation.
In order to make the air conditioner adapt to the control under different outdoor environment temperatures, the target output temperature and the outdoor environment temperature are correspondingly set so as to more accurately identify the low-voltage and low-voltage state of the system, carry out corresponding control in time and maintain the reliable operation of the air conditioner.
Optionally, the correspondence between the outdoor environment temperature and the target output temperature at least includes one of:
when the outdoor environment temperature satisfies: when Tao is less than or equal to 0 ℃, the target output temperature is as follows: tm is more than or equal to 2 ℃ and less than 3 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 0 ℃ and less than or equal to 5 ℃, the target output temperature is more than or equal to 3 ℃ and Tm is less than 4 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 5 ℃ and less than or equal to 10 ℃, the target output temperature is more than or equal to 4 ℃ and Tm is less than 5 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 10 ℃ and less than or equal to 18 ℃, the target output temperature is that Tm is more than or equal to 5 ℃;
wherein Tao is the outdoor ambient temperature, and Tm is the target output temperature.
By presetting the corresponding relation between the outdoor environment temperature and the target output temperature, the target output temperature is changed along with the change of the outdoor environment temperature, so that the control is more accurate.
The present invention also provides a control device for an outdoor fan of an air conditioner, comprising:
an obtaining unit for obtaining an actual output temperature, wherein the actual output temperature is determined based on an inlet temperature of the indoor heat exchanger;
the acquisition unit is also used for acquiring a target output temperature;
a calculation unit for determining a difference between the actual output temperature and the target output temperature;
a control unit for controlling a rotation speed of the outdoor fan based on the difference.
The invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and the computer program is read by the processor and runs to realize the control method of the air conditioner outdoor fan. Compared with the prior art, the air conditioner and the control method of the air conditioner outdoor fan have the same advantages, and are not described again.
The invention further provides a computer readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the control method of the air conditioner outdoor fan is realized. The advantages of the computer readable storage medium and the control method of the air conditioner outdoor fan are the same as the advantages of the prior art, and are not repeated herein.
Drawings
FIG. 1 is a schematic diagram illustrating a method for controlling an outdoor fan of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an embodiment of a method for controlling an outdoor fan of an air conditioner according to the present invention, which is detailed in step S10;
fig. 3 is a schematic diagram of a detailed step S40 of the control method of the outdoor fan of the air conditioner according to the present invention;
fig. 4 is a schematic view illustrating an example of a method for controlling an outdoor fan of an air conditioner according to the present invention;
FIG. 5 is a schematic diagram of a detailed step S20 of the control method for the outdoor fan of the air conditioner in accordance with the present invention;
fig. 6 is a schematic view illustrating a control device of an outdoor fan of an air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic view of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
101-acquisition unit, 102-calculation unit, 103-control unit, 201-computer-readable storage medium, 202-processor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In order to facilitate understanding of the embodiments of the present invention, a description will be first made of drawbacks of the prior art.
Because the temperature of the coil pipe of the outdoor heat exchanger and the exhaust pressure form a positive correlation relationship in a normal state of the air conditioner, in the prior art, the temperature of the coil pipe of the outdoor heat exchanger is used for simulating the pressure of a system, so that the rotating speed of an outdoor fan is controlled, and the differential pressure of the system is guaranteed to realize reliable operation. Under normal conditions, after the high-temperature and high-pressure gaseous refrigerant enters the outdoor heat exchanger, the refrigerant is condensed by the outdoor heat exchanger, becomes a gas-liquid two-phase state, and then becomes a liquid refrigerant to flow out of the outdoor heat exchanger and flow to the throttling element.
However, when the outdoor environment temperature is lower than a certain value, the outdoor heat exchanger coil is greatly influenced by the outdoor environment temperature, after high-temperature and high-pressure gaseous refrigerant enters the outdoor heat exchanger, the refrigerant liquefaction speed is accelerated in a gas-liquid two-phase state, the liquid refrigerant is increased in proportion, the liquid refrigerant is separated from the gaseous refrigerant under the action of gravity to form accumulated liquid, and then a pattern that the upper part is the gaseous refrigerant and the lower part is the liquid refrigerant is formed in the outdoor coil. That is, the outdoor coil temperature that detects this moment can be distorted, can't accurately represent air conditioning system's pressure situation again to cause fan rotational speed control mistake or unable accurate control, lead to air conditioning system pressure fluctuation, and then lead to indoor air-out temperature fluctuation, perhaps the indoor heat exchanger condition of freezing appears.
The invention provides a control method of an outdoor fan of an air conditioner, which can be used for low-temperature refrigeration working conditions. Fig. 1 is a schematic view illustrating a method for controlling an outdoor fan of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, the method for controlling the outdoor fan of the air conditioner includes:
step S10, acquiring an actual output temperature, wherein the actual output temperature is determined based on the inlet temperature of the indoor heat exchanger;
when the air conditioner runs in a refrigeration mode in a low-temperature environment, the actual output temperature determined based on the relevant temperature parameters of the indoor heat exchanger is used as the control parameter of the outdoor fan, the temperature of the indoor heat exchanger is relatively less influenced by the outdoor environment temperature, the temperature of the indoor heat exchanger can more stably reflect the high pressure and the low pressure of an air conditioning system, the rotating speed of the fan is accurately controlled, the pressure fluctuation of the air conditioner is avoided, and the comfort is improved. In addition, because the indoor heat exchanger can show abnormal low temperature when the low pressure of the air conditioner is low and the indoor heat exchanger has the risk of freezing, the size of the risk of freezing of the indoor heat exchanger is represented by the related temperature parameters of the indoor heat exchanger and is controlled correspondingly.
Optionally, the actual output temperature is an inlet temperature of the indoor heat exchanger.
The refrigerant condensed by the outdoor heat exchanger enters the indoor heat exchanger, undergoes phase change of liquid refrigerant-gas-liquid two-phase-gaseous refrigerant in the indoor heat exchanger, the temperature of the indoor heat exchanger is gradually increased, so that the temperature of the inlet, the middle part and the outlet of the indoor heat exchanger is also sequentially increased, the inlet temperature of the indoor heat exchanger is the lowest temperature position of the three parts, therefore, the inlet temperature of the indoor heat exchanger is used as the actual output temperature for subsequent judgment, the problem of over-low temperature of the indoor heat exchanger can be detected as early as possible, and simultaneously, as the inlet of the indoor heat exchanger is filled with liquid refrigerant, the temperature of the air conditioner is stable, the air conditioner can accurately detect the temperature, the accuracy and the stability of follow-up control are guaranteed, the rotating speed of the outdoor fan is adjusted in time, unnecessary fluctuation of the air conditioner system is avoided, fluctuation of indoor air outlet temperature is caused, and meanwhile the indoor heat exchanger is prevented from freezing.
Optionally, the actual output temperature is determined according to the inlet temperature and the middle temperature.
Optionally, the actual output temperature is determined from the inlet temperature and the outlet temperature.
Optionally, the actual output temperature is determined according to an inlet temperature, a middle temperature and an outlet temperature of the indoor heat exchanger.
If the control is performed only based on the inlet temperature of the indoor heat exchanger, if the temperature sensor for detecting the inlet temperature has problems, such as damage or degradation of detection precision, the subsequent control is inaccurate, and the pressure of the air conditioner may fluctuate abnormally, so that the air conditioner cannot operate reliably. For improving the operation reliability of the air conditioner, the actual output temperature is determined based on the inlet temperature and the middle temperature of the indoor heat exchanger, or the inlet temperature and the outlet temperature are determined, or the inlet temperature, the middle temperature and the outlet temperature are determined together, so that even if the detection of the inlet temperature is wrong, the middle temperature and/or the outlet temperature can be compensated, the dependence of air conditioner control on a single temperature value/temperature sensor is reduced, the fault tolerance is improved, the control of an outdoor fan is more accurate, and the operation reliability of the air conditioner is improved.
When the actual output temperature is determined based on the inlet temperature, the middle temperature and the outlet temperature, the inlet temperature, the middle temperature and the outlet temperature of the indoor heat exchanger can be detected in real time or at regular time or at fixed time intervals, and the inlet temperature, the middle temperature and the outlet temperature are transmitted to a calculating unit (which can be arranged in an air conditioner controller) so as to be correspondingly calculated by the air conditioner controller. After the actual output temperature is calculated based on the inlet temperature, the middle temperature, and the outlet temperature, the actual output temperature is stored for acquisition in a subsequent control program, that is, for acquisition in step S10.
The actual output temperature is obtained through calculation based on the inlet temperature, the middle temperature and the outlet temperature of the indoor heat exchanger, the average value of the inlet temperature, the middle temperature and the outlet temperature can be calculated to serve as the actual output temperature, the weighted value can also be distributed to the three, and the weighted average value of the three is calculated to serve as the actual output temperature.
Optionally, as shown in fig. 2, the obtaining of the actual output temperature includes:
and acquiring the current inlet temperature, the current middle temperature and the current outlet temperature of the indoor heat exchanger, and determining the actual output temperature based on the inlet temperature, the middle temperature and the outlet temperature.
The temperature sensing bags are respectively arranged at the inlet, the middle part and the outlet of the indoor heat exchanger and are connected with the air conditioner controller, and the temperature sensing bags transmit the detected inlet temperature, the detected middle part temperature and the detected outlet temperature to the controller.
Substituting the current inlet temperature, the current middle temperature and the current outlet temperature into a preset formula, and calculating to obtain the actual output temperature, wherein the preset formula is as follows:
t1 ═ T + TB + TC)/k, where T1 is the actual output temperature, TA is the inlet temperature, TB is the middle temperature, TC is the outlet temperature, and 3< k is not more than 3.5.
Among the inlet temperature, the middle temperature and the outlet temperature of the indoor heat exchanger, the inlet temperature is the lowest, the middle temperature is the second highest and the outlet temperature is the highest, k satisfies 3< k is less than or equal to 3.5, k is greater than 3, the finally calculated actual output temperature is lower and closer to the inlet temperature, k is less than or equal to 3.5, the finally calculated value of the air conditioner is not deviated from the inlet temperature, and therefore the accuracy of the actual output temperature can be improved.
Alternatively, after the compressor of the air conditioner is operated for a certain period of time (e.g., after 5-10 minutes), the inlet temperature is detected and then used as the actual output temperature. Alternatively, after the compressor of the air conditioner is operated for a certain period of time (e.g., after 5-10 minutes), the inlet temperature, the middle temperature, and the outlet temperature of the indoor heat exchanger are detected, and the actual output temperature is determined based on the detected inlet temperature, middle temperature, and outlet temperature. The air conditioner can be stably operated after being started for a certain time, so that the problem that the relevant temperature parameters are inaccurate due to the fact that the air conditioner is not stably operated is solved, and the inlet temperature, the middle temperature and the outlet temperature of the indoor heat exchanger are detected after the compressor is operated for a time which is more than or equal to a certain time.
Step S20, acquiring a target output temperature;
the target output temperature may be a temperature value preset in the air conditioner to be fixed, and may be 2-5 ℃.
Alternatively, the target output temperature is determined based on the current outer ring temperature, i.e., the current target output temperature is dynamically determined on-the-fly based on the current outer ring temperature for control.
Alternatively, a relatively fixed target output temperature is determined based on the average value of the outer ring temperature and the inner ring temperature for a certain time, and the target output temperature is controlled for a period of time and then determined again based on the average value of the outer ring temperature. Specifically, at the initial stage of the air conditioner, that is, when the air conditioner is just installed, the air conditioner does not collect enough data of the outer ring temperature, at this time, the initial preset temperature value of the air conditioner is directly used as the target output temperature for control, after the outer ring temperatures of a plurality of time points (the span can be one day, several days and one month) of the actual installation point are collected, the average value of the outer ring temperatures is calculated, and based on the average value of the outer ring temperatures, the corresponding temperature value is determined as the target output temperature for subsequent outdoor fan control. Optionally, the air conditioner presets a corresponding relationship between the outer ring temperature average value and the target output temperature, the target output temperature can be determined after the outer ring temperature average value is determined, the outer ring temperature average value can be re-determined after a certain time interval, and the target output temperature is updated based on the re-determined outer ring temperature average value, so that the high-low pressure control of the air conditioner is adaptive to the actual environment of the air conditioner, and the control is more accurate.
Step S30, determining a difference between the actual output temperature and the target output temperature;
the difference between the actual output temperature and the target output temperature may be a difference obtained by subtracting the actual output temperature from the target output temperature, or may be a difference obtained by subtracting the target output temperature from the actual output temperature.
And step S40, controlling the rotating speed of the outdoor fan based on the difference value.
In an embodiment, a difference between the actual output temperature and the target output temperature is a difference obtained by subtracting the actual output temperature from the target output temperature, when the difference is greater than 0, it indicates that the actual output temperature is less than the target output temperature, and the temperature of the indoor heat exchanger is relatively low, and when the difference is greater than a preset positive number (i.e., greater than 0, optionally 2 ℃), it indicates that the actual output temperature is relatively low and the indoor heat exchanger has a risk of icing, and at this time, the outdoor fan is controlled to reduce the rotation speed to increase the low pressure and remove the risk of icing of the indoor heat exchanger.
In another embodiment, the difference between the actual output temperature and the target output temperature is a difference obtained by subtracting the target output temperature from the actual output temperature, and when the difference is less than 0, it indicates that the actual output temperature is less than the target output temperature, and the temperature of the indoor heat exchanger is relatively low, and when the difference is less than a preset positive number (i.e., less than 0, optionally-2 ℃), it indicates that the actual output temperature is relatively low, and the indoor heat exchanger has a risk of icing. At this time, the rotating speed of the outdoor fan needs to be controlled to increase the low pressure.
When the rotating speed of the outdoor fan needs to be reduced, the rotating speed with a fixed amplitude can be reduced, for example, 1 wind gear or 2 wind gears are reduced, the rotating speed reduction amplitude can also be determined according to the absolute value of the difference between the actual output temperature and the target output temperature, and the larger the absolute value of the difference is, the larger the rotating speed reduction amplitude is. Conversely, the smaller the absolute value of the difference, the smaller the reduction in the rotational speed.
The embodiment of the invention controls the rotating speed of the outdoor fan through the actual output temperature so as to control the high pressure and the low pressure of the air conditioning system, the actual output temperature is determined according to the inlet temperature of the indoor heat exchanger, the inlet temperature of the indoor heat exchanger is less influenced by the outdoor environment temperature, the control stability is higher, the rotating speed of the outdoor fan can be accurately controlled, the pressure fluctuation of the air conditioning system is avoided, the comfort is improved, the rotating speed can be obtained by arranging a temperature sensing bulb on the indoor heat exchanger, the cost is lower, and the popularization and the use are easy; based on the difference between the actual output temperature and the target output temperature, whether the low pressure of the air conditioner is too low or not and whether the indoor heat exchanger has the risk of icing or not can be judged, and then how to control the rotating speed of the outdoor fan is determined, so that the air conditioner can run reliably.
Alternatively, as shown in fig. 3, the step S40 includes:
step S41, when the difference is smaller than or equal to a first preset temperature, controlling the rotating speed of the outdoor fan to reduce a preset amplitude;
step S42, after the outdoor fan is controlled to operate at the current rotating speed for a preset time, whether the difference value is smaller than or equal to the first preset temperature is judged;
and when the difference value is smaller than or equal to the first preset temperature, returning to the step of controlling the rotating speed of the outdoor fan to reduce the preset amplitude.
In this embodiment, the difference is obtained by subtracting the target output temperature from the actual output temperature. When the difference value obtained by subtracting the target output temperature from the actual output temperature is smaller than a certain value, the temperature of the indoor heat exchanger is low, the rotating speed of the outdoor fan needs to be increased, and the low pressure needs to be increased. And after a judgment result that the difference value is less than or equal to the first preset temperature is obtained, the rotating speed of the outdoor fan is reduced by a preset amplitude, wherein the preset amplitude can be selected to be 1 gear or 2 gears.
The current rotating speed refers to the current rotating speed of the outdoor fan after the preset amplitude is adjusted. The preset time can be selected to be 2-3 min.
After primary fan rotating speed adjustment is carried out, the air conditioner runs for a preset time length at the adjusted fan rotating speed, during the period, the low pressure of the air conditioner is increased, then, the difference value obtained by subtracting the target output temperature from the actual output temperature is judged again, whether the current outdoor fan rotating speed effectively increases the low pressure or not is judged, the temperature of the indoor heat exchanger is increased, if the difference value is larger than the first preset temperature, the outdoor fan rotating speed is reduced to the current fan rotating speed, and the effect is obvious: the low pressure is increased, the temperature of the indoor heat exchanger is increased, the outdoor fan can be continuously controlled to operate at the current fan rotating speed, if the difference value is still smaller than or equal to the first preset temperature, the rotating speed of the outdoor fan is reduced to the current fan rotating speed, the effect is weak, the current state of the air conditioner cannot be obviously improved, and the rotating speed of the outdoor fan needs to be continuously reduced to further increase the low pressure.
The preset duration is set so that the air conditioner can operate for a period of time at the adjusted rotating speed of the fan and wait for the generation of the effect of the air conditioner, and thus, the rotating speed of the fan with beneficial effects on the current state of the air conditioner can be slowly determined through one-step and one-step adjustment, the indoor heat exchanger is prevented from being frozen, and the normal operation of the air conditioner is maintained.
Optionally, the first preset temperature satisfies: t is more than or equal to-3 ℃ and less than or equal to-1 ℃, wherein T is the first preset temperature. When the actual output temperature is lower than the target output temperature by more than 1-3 ℃, the rotating speed of the outdoor fan needs to be adjusted to increase the low-pressure, so that the pressure state of the air conditioner can be determined in time, the temperature of the indoor heat exchanger is increased, and the indoor heat exchanger is prevented from being frozen.
As shown in fig. 4, T1 is the actual output temperature and T2 is the target output temperature, taking T ═ 2 ℃, the preset time period is 2 minutes as an example. And after 5 minutes of refrigeration and startup, judging whether the rotating speed Fan is less than or equal to-2 ℃ from T1-T2, when the temperature T1-T2 is less than or equal to-2 ℃, controlling the rotating speed Fan of the outdoor Fan to be reduced by one gear, judging whether the rotating speed Fan is less than or equal to-2 ℃ from T1-T2 after 2 minutes, if the rotating speed Fan still meets the temperature T1-T2, reducing the rotating speed Fan of the outdoor Fan by one gear on the basis of the current rotating speed, and repeating the above process until the rotating speed Fan of the outdoor Fan is reduced to 0 gear and cannot be reduced. Wherein, if the temperature is not more than or equal to-2 ℃ between T1 and T2, the current rotating speed of the outdoor fan can be kept unchanged.
Alternatively, as shown in fig. 5, the step S20 includes:
step S21, acquiring the current outdoor environment temperature, and acquiring the corresponding relation between the preset outdoor environment temperature and the target output temperature;
step S22, determining a target output temperature corresponding to the current outdoor ambient temperature based on the correspondence.
The current outdoor environment temperature can be obtained through an outer ring temperature sensor or can be obtained through networking.
The corresponding relation between the outdoor environment temperature and the target output temperature is preset in the air conditioner, after the current outdoor environment temperature is obtained, the corresponding relation is inquired, the target output temperature corresponding to the current outdoor environment temperature is determined, and the target output temperature is used as the current control parameter for subsequent outdoor fan control.
Optionally, the correspondence between the outdoor environment temperature and the target output temperature at least includes one of:
when the outdoor environment temperature satisfies: when Tao is less than or equal to 0 ℃, the target output temperature is as follows: tm is more than or equal to 2 ℃ and less than 3 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 0 ℃ and less than or equal to 5 ℃, the target output temperature is more than or equal to 3 ℃ and Tm is less than 4 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 5 ℃ and less than or equal to 10 ℃, the target output temperature is more than or equal to 4 ℃ and Tm is less than 5 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 10 ℃ and less than or equal to 18 ℃, the target output temperature is that Tm is more than or equal to 5 ℃;
wherein Tao is the outdoor ambient temperature, and Tm is the target output temperature.
In actual implementation, the target output temperature is fixed, and the range of the target output temperature is as described above. By presetting the corresponding relation between the outdoor environment temperature and the target output temperature, the target output temperature is changed along with the change of the outdoor environment temperature, so that the control is more accurate.
The interior of the air conditioner can be inevitably affected by the environment, under the same condition, when the outdoor environment temperature is lower, the internal temperature is relatively higher, the outdoor environment temperature is higher, and the internal temperature is relatively higher, so that under the normal state, the actual output temperature of the air conditioner is also higher, and further, in order to make the air conditioner adapt to the control under different outdoor environment temperatures, the target output temperature and the outdoor environment temperature are correspondingly set, so that the low-voltage and low-voltage state of the system can be more accurately identified, the corresponding control is carried out in time, and the reliable operation of the air conditioner is maintained.
The invention also provides a control device of the outdoor fan of the air conditioner. Fig. 6 is a schematic diagram of an embodiment of the control device. As shown in fig. 6, the control device includes:
an obtaining unit 101, configured to obtain an actual output temperature, where the actual output temperature is determined based on an inlet temperature of the indoor heat exchanger;
the acquiring unit 101 is further configured to acquire a target output temperature;
a calculation unit 102 for determining a difference between the actual output temperature and the target output temperature;
a control unit 103 for controlling the rotation speed of the outdoor fan based on the difference.
Optionally, the obtaining unit 101 is further configured to obtain a current inlet temperature, a current middle temperature, and a current outlet temperature of the indoor heat exchanger;
substituting the current inlet temperature, the current middle temperature and the current outlet temperature into a preset formula, and calculating to obtain the actual output temperature, wherein the preset formula is as follows:
t1 ═ T + TB + TC)/k, where T1 is the actual output temperature, TA is the inlet temperature, TB is the middle temperature, TC is the outlet temperature, and 3< k is not more than 3.5.
Optionally, the control unit 103 is further configured to control the rotation speed of the outdoor fan to decrease by a preset amplitude when the difference is smaller than or equal to a first preset temperature.
Optionally, the control unit 103 is further configured to, after the controlling the rotation speed of the outdoor fan to decrease by a preset magnitude, further perform: after controlling the outdoor fan to operate at the current rotating speed for a preset time, judging whether the difference value is less than or equal to the first preset temperature; and when the difference value is smaller than or equal to the first preset temperature, returning to the step of controlling the rotating speed of the outdoor fan to reduce the preset amplitude.
Optionally, the first preset temperature satisfies: t is more than or equal to-3 ℃ and less than or equal to-1 ℃, wherein T is the first preset temperature.
Optionally, the obtaining unit 101 is further configured to obtain a current outdoor environment temperature, and obtain a corresponding relationship between a preset outdoor environment temperature and a target output temperature; and determining a target output temperature corresponding to the current outdoor environment temperature based on the corresponding relation.
Optionally, the correspondence between the outdoor environment temperature and the target output temperature at least includes one of:
when the outdoor environment temperature satisfies: when Tao is less than or equal to 0 ℃, the target output temperature is as follows: tm is more than or equal to 2 ℃ and less than 3 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 0 ℃ and less than or equal to 5 ℃, the target output temperature is more than or equal to 3 ℃ and Tm is less than 4 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 5 ℃ and less than or equal to 10 ℃, the target output temperature is more than or equal to 4 ℃ and Tm is less than 5 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 10 ℃ and less than or equal to 18 ℃, the target output temperature is that Tm is more than or equal to 5 ℃;
wherein Tao is the outdoor ambient temperature, and Tm is the target output temperature.
The invention also provides an air conditioner. Fig. 7 is a schematic diagram of an embodiment of the air conditioner, and as shown in fig. 7, the air conditioner includes a computer-readable storage medium 201 storing a computer program and a processor 202, and the computer program is read by the processor 202 and executed to implement the method for controlling the outdoor fan of the air conditioner according to the above embodiments.
The present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the method for controlling the outdoor fan of the air conditioner according to the above embodiments.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A control method of an outdoor fan of an air conditioner is characterized by comprising the following steps:
acquiring an actual output temperature, wherein the actual output temperature is determined based on an inlet temperature of an indoor heat exchanger;
acquiring a target output temperature;
determining a difference between the actual output temperature and the target output temperature;
and controlling the rotating speed of the outdoor fan based on the difference value.
2. The method of claim 1, wherein the obtaining of the actual output temperature comprises:
acquiring the current inlet temperature, the current middle temperature and the current outlet temperature of the indoor heat exchanger;
determining the actual output temperature based on the inlet temperature, the mid-section temperature, and the outlet temperature.
3. The method of claim 2, wherein the determining the actual output temperature based on the inlet temperature, the mid-section temperature, and the outlet temperature comprises:
substituting the current inlet temperature, the current middle temperature and the current outlet temperature into a preset formula, and calculating to obtain the actual output temperature, wherein the preset formula is as follows:
t1 ═ T + TB + TC)/k, where T1 is the actual output temperature, TA is the inlet temperature, TB is the middle temperature, TC is the outlet temperature, and 3< k is not more than 3.5.
4. The method of controlling an outdoor fan of an air conditioner according to any one of claims 1 to 3, wherein the controlling the rotation speed of the outdoor fan based on the difference value includes:
when the difference value is smaller than or equal to a first preset temperature, controlling the rotating speed of the outdoor fan to reduce a preset amplitude;
after controlling the outdoor fan to operate at the current rotating speed for a preset time, judging whether the difference value is less than or equal to the first preset temperature;
and when the difference value is smaller than or equal to the first preset temperature, returning to the step of controlling the rotating speed of the outdoor fan to reduce the preset amplitude.
5. The method as claimed in claim 4, wherein the first preset temperature satisfies: t is more than or equal to-3 ℃ and less than or equal to-1 ℃, wherein T is the first preset temperature.
6. The method of controlling an outdoor fan of an air conditioner according to any one of claims 1 to 3, wherein the obtaining of the target output temperature includes:
acquiring the current outdoor environment temperature, and acquiring the corresponding relation between the preset outdoor environment temperature and the target output temperature;
and determining a target output temperature corresponding to the current outdoor environment temperature based on the corresponding relation.
7. The method as claimed in claim 6, wherein the correspondence between the outdoor ambient temperature and the target output temperature at least comprises one of:
when the outdoor environment temperature satisfies: when Tao is less than or equal to 0 ℃, the target output temperature is as follows: tm is more than or equal to 2 ℃ and less than 3 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 0 ℃ and less than or equal to 5 ℃, the target output temperature is more than or equal to 3 ℃ and Tm is less than 4 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 5 ℃ and less than or equal to 10 ℃, the target output temperature is more than or equal to 4 ℃ and Tm is less than 5 ℃;
when the outdoor environment temperature satisfies: when Tao is more than or equal to 10 ℃ and less than or equal to 18 ℃, the target output temperature is that Tm is more than or equal to 5 ℃;
wherein Tao is the outdoor ambient temperature, and Tm is the target output temperature.
8. A control device of an outdoor fan of an air conditioner is characterized by comprising:
an obtaining unit (101) for obtaining an actual output temperature, wherein the actual output temperature is determined based on an inlet temperature of an indoor heat exchanger;
the acquisition unit (101) is also used for acquiring a target output temperature;
a calculation unit (102) for determining a difference between the actual output temperature and the target output temperature;
a control unit (103) for controlling the rotational speed of the outdoor fan based on the difference.
9. An air conditioner, comprising a computer-readable storage medium (201) storing a computer program and a processor (202), wherein the computer program is read and executed by the processor (202) to implement the method of controlling the outdoor fan of the air conditioner according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the method of controlling the outdoor fan of the air conditioner according to any one of claims 1 to 7.
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| CN111442503B (en) | 2021-09-17 |
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