CN113375284B - External fan control method and device and air conditioner - Google Patents
External fan control method and device and air conditioner Download PDFInfo
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- CN113375284B CN113375284B CN202110737966.3A CN202110737966A CN113375284B CN 113375284 B CN113375284 B CN 113375284B CN 202110737966 A CN202110737966 A CN 202110737966A CN 113375284 B CN113375284 B CN 113375284B
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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
- F24F11/62—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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F2110/40—Pressure, e.g. wind pressure
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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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- Air Conditioning Control Device (AREA)
Abstract
The invention provides an external fan control method and device and an air conditioner, and relates to the technical field of air conditioners. The outer fan control method comprises the following steps: acquiring the exhaust pressure of the air conditioner in real time; under the condition that the exhaust pressure falls into a first preset pressure interval, calculating a first theoretical regulating quantity according to the exhaust pressure; adjusting the rotating speed of an outer fan of the air conditioner according to the first theoretical adjustment quantity; under the condition that the exhaust pressure falls into a second preset pressure interval, acquiring the heat exchange temperature difference of the outdoor heat exchanger, wherein the upper limit value of the second preset pressure interval is equal to the lower limit value of the first preset pressure interval; calculating a second theoretical regulating quantity according to the heat exchange temperature difference; and adjusting the rotating speed of the external fan according to the second theoretical adjustment quantity. The external fan control method provided by the invention can accurately adjust the rotating speed of the external fan on the premise of meeting the requirement of exhaust pressure, and avoids energy waste.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an external fan control method and device and an air conditioner.
Background
In practical application, the air conditioner runs in full load at the early stage, the room temperature is quickly reduced, and low-load running is adopted at most of the later stage.
In the low-load operation process of the air conditioner in the market, the rotating speed of the outer fan is correspondingly adjusted according to the outdoor environment temperature through preset parameters. Although the adjusting mode can effectively prevent the exhaust pressure from being too high, the rotating speed of the external fan is not accurately adjusted, and excessive energy waste is caused.
Disclosure of Invention
The invention solves the problem that in the prior art, the rotating speed control of an external fan is not accurate enough in the low-load operation process of an air conditioner, so that excessive energy waste is caused.
In order to solve the problems, the invention provides an external fan control method which can accurately adjust the rotating speed of an external fan on the premise of meeting the requirement of exhaust pressure and avoid energy waste.
The embodiment of the invention provides an external fan control method, which is applied to an air conditioner and comprises the following steps:
acquiring the exhaust pressure of the air conditioner in real time;
under the condition that the exhaust pressure falls into a first preset pressure interval, calculating a first theoretical regulating quantity according to the exhaust pressure;
adjusting the rotating speed of an outer fan of the air conditioner according to the first theoretical adjustment quantity;
under the condition that the exhaust pressure falls into a second preset pressure interval, acquiring the heat exchange temperature difference of the outdoor heat exchanger, wherein the upper limit value of the second preset pressure interval is equal to the lower limit value of the first preset pressure interval;
calculating a second theoretical regulating quantity according to the heat exchange temperature difference;
and adjusting the rotating speed of the outer fan according to the second theoretical adjustment quantity.
In practical application, the method for controlling the external fan provided by the embodiment of the invention performs different control on the rotating speed of the external fan according to the acquired exhaust pressure of the air conditioner, and calculates the first theoretical regulating quantity according to the exhaust pressure under the condition of higher exhaust pressure so as to obtain the lowest rotating speed, thereby avoiding energy consumption waste caused by overhigh rotating speed of the external fan. Under the condition of moderate exhaust pressure, the second theoretical regulating quantity is calculated according to the heat exchange temperature difference of the outdoor heat exchanger, so that the lowest rotating speed is obtained, and energy consumption waste caused by overhigh rotating speed of the outer fan is avoided. Therefore, the method for controlling the outer fan provided by the embodiment of the invention can accurately adjust the rotating speed of the outer fan on the premise of meeting the requirement of the exhaust pressure, and avoid energy waste.
In an alternative embodiment, the step of calculating a first theoretical adjustment amount based on the exhaust pressure in a case where the exhaust pressure falls within a first preset pressure interval includes:
under the condition that the exhaust pressure falls into a first preset pressure interval, calculating the exhaust pressure minus a preset exhaust pressure target value to obtain an exhaust pressure difference value, wherein the exhaust pressure target value is smaller than or equal to a lower limit value of the first preset pressure interval;
and calculating the product of the exhaust pressure difference and a preset first coefficient to obtain the first theoretical regulating quantity.
In an optional embodiment, the step of adjusting the rotation speed of the external fan of the air conditioner according to the first theoretical adjustment amount includes:
comparing the first theoretical regulating quantity with a plurality of preset first rotating speed intervals;
selecting a first actual regulating variable corresponding to the first rotating speed interval in which the first theoretical regulating variable is positioned;
and controlling the rotating speed of the outer fan to change the first actual regulating quantity.
In an optional embodiment, the step of obtaining the heat exchange temperature difference of the outdoor heat exchanger when the discharge pressure falls within a second preset pressure interval includes:
under the condition that the exhaust pressure falls into the second preset pressure interval, respectively acquiring the outdoor environment temperature and the defrosting temperature of the outdoor heat exchanger;
and calculating the defrosting temperature minus the corresponding outdoor environment temperature to obtain the heat exchange temperature difference.
In an optional embodiment, the step of calculating a second theoretical adjustment amount according to the heat exchange temperature difference comprises:
acquiring a temperature difference target value;
calculating the difference value of the temperature difference obtained by subtracting the target value of the temperature difference from the heat exchange temperature difference;
and calculating the product of the temperature difference value and a preset second coefficient to obtain the second theoretical regulating quantity.
In an alternative embodiment, the step of obtaining the target temperature difference value includes:
acquiring indoor temperature;
calculating the indoor temperature minus the set temperature of the air conditioner to obtain the indoor temperature difference;
comparing the indoor temperature difference with a plurality of preset temperature intervals;
and selecting the temperature difference target value corresponding to the temperature interval where the indoor temperature difference is located.
In an optional embodiment, the step of adjusting the rotation speed of the external fan according to the second theoretical adjustment amount includes:
comparing the second theoretical regulating quantity with a plurality of preset second rotating speed intervals;
selecting a second actual regulating variable corresponding to the second rotating speed interval in which the second theoretical regulating variable is positioned;
and controlling the rotating speed of the outer fan to change the second actual regulating quantity.
In an optional embodiment, after the step of obtaining the discharge pressure of the air conditioner in real time, the method further includes:
and under the condition that the exhaust pressure falls into a third preset pressure interval, controlling the outer fan to operate at the maximum rotating speed, wherein the lower limit value of the third preset pressure interval is equal to the upper limit value of the first preset pressure interval.
In an optional embodiment, after the step of obtaining the discharge pressure of the air conditioner in real time, the method further includes:
and under the condition that the exhaust pressure falls into a fourth preset pressure interval, controlling the outer fan to stop, wherein the upper limit value of the fourth preset pressure interval is equal to the lower limit value of the second preset pressure interval.
An embodiment of the present invention further provides an external blower control device applied to an air conditioner, including:
the acquisition module is used for acquiring the exhaust pressure of the air conditioner in real time;
the calculation module is used for calculating a first theoretical regulating quantity according to the exhaust pressure under the condition that the exhaust pressure falls into a first preset pressure interval;
the adjusting module is used for adjusting the rotating speed of an external fan of the air conditioner according to the first theoretical adjustment quantity;
the acquisition module is further used for acquiring the heat exchange temperature difference of the outdoor heat exchanger under the condition that the exhaust pressure falls into a second preset pressure interval, wherein the upper limit value of the second preset pressure interval is equal to the lower limit value of the first preset pressure interval;
the calculation module is also used for calculating a second theoretical regulating quantity according to the heat exchange temperature difference;
and the adjusting module is also used for adjusting the rotating speed of the outer fan according to the second theoretical adjustment quantity.
In practical application, the external fan control device provided by the embodiment of the invention performs different control on the rotating speed of the external fan according to the acquired exhaust pressure of the air conditioner, and calculates the first theoretical regulating quantity according to the exhaust pressure under the condition of higher exhaust pressure so as to obtain the lowest rotating speed, thereby avoiding energy consumption waste caused by overhigh rotating speed of the external fan. Under the condition of moderate exhaust pressure, the second theoretical regulating quantity is calculated according to the heat exchange temperature difference of the outdoor heat exchanger, so that the lowest rotating speed is obtained, and energy consumption waste caused by overhigh rotating speed of the outer fan is avoided. Therefore, the external fan control device provided by the embodiment of the invention can accurately adjust the rotating speed of the external fan on the premise of meeting the requirement of the exhaust pressure, and avoids energy waste.
An embodiment of the present invention further provides an air conditioner, including a controller, where the controller is configured to execute the external fan control method, where the external fan control method includes: acquiring the exhaust pressure of the air conditioner in real time; under the condition that the exhaust pressure falls into a first preset pressure interval, calculating a first theoretical regulating quantity according to the exhaust pressure; adjusting the rotating speed of an outer fan of the air conditioner according to the first theoretical adjustment quantity; under the condition that the exhaust pressure falls into a second preset pressure interval, acquiring the heat exchange temperature difference of the outdoor heat exchanger, wherein the upper limit value of the second preset pressure interval is equal to the lower limit value of the first preset pressure interval; calculating a second theoretical regulating quantity according to the heat exchange temperature difference; and adjusting the rotating speed of the outer fan according to the second theoretical adjustment quantity.
In practical application, the rotating speed of the external fan is controlled differently according to the obtained exhaust pressure, and the first theoretical regulating quantity is calculated according to the exhaust pressure under the condition that the exhaust pressure is higher, so that the lowest rotating speed is obtained, and further energy consumption waste caused by overhigh rotating speed of the external fan is avoided. Under the condition of moderate exhaust pressure, the second theoretical regulating quantity is calculated according to the heat exchange temperature difference of the outdoor heat exchanger, so that the lowest rotating speed is obtained, and energy consumption waste caused by overhigh rotating speed of the outer fan is avoided. Therefore, the air conditioner provided by the embodiment of the invention can accurately adjust the rotating speed of the outer fan on the premise of meeting the requirement of the exhaust pressure, and avoids energy waste.
Drawings
Fig. 1 is a block flow diagram of an external fan control method according to an embodiment of the present invention;
FIG. 2 is a block diagram of a sub-step of step S102 in FIG. 1;
FIG. 3 is a block diagram of a sub-step of step S103 in FIG. 1;
FIG. 4 is a block diagram of a sub-step of step S104 in FIG. 1;
FIG. 5 is a block diagram of a sub-step of step S105 in FIG. 1;
FIG. 6 is a block flow diagram of a sub-step of substep S1051 of FIG. 5;
FIG. 7 is a block diagram of a sub-step of step S106 in FIG. 1;
fig. 8 is a block diagram of an external blower control device according to an embodiment of the present invention.
Description of reference numerals:
100-external fan control device; 110-an obtaining module; 120-a calculation module; 130-adjusting module.
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.
Referring to fig. 1, fig. 1 is a block flow diagram illustrating a method for controlling an external fan according to the present embodiment. The outer fan control method is applied to the air conditioner, and in the process of running the air conditioner at low load, the outer fan control method can accurately adjust the rotating speed of the outer fan on the premise of meeting the requirement of exhaust pressure, so that energy waste is avoided. The external fan control method provided by the embodiment comprises the following steps:
and step S101, acquiring the exhaust pressure of the air conditioner in real time.
In this embodiment, the pressure sensor is disposed at the exhaust port of the compressor of the air conditioner, so as to detect the pressure at the exhaust port of the compressor in real time, and receive the detection data of the pressure sensor, i.e., obtain the exhaust pressure of the air conditioner.
Further, the external fan control method may further include:
and step S102, under the condition that the exhaust pressure falls into a first preset pressure interval, calculating a first theoretical regulating quantity according to the exhaust pressure.
In fact, after the exhaust pressure is obtained in step S101, the exhaust pressure is compared with a plurality of preset intervals, in this embodiment, the plurality of preset intervals include a first preset interval, a second preset interval, a third preset interval, and a fourth preset interval.
Wherein the first predetermined interval is (P1, P3), the second predetermined interval is [ P2, P1], the third predetermined interval is [ P3, + ∞ ], and the fourth predetermined interval is (-infinity, P2). The value of P1 is in the range of 28bar to 34bar, preferably 31bar in this example; the value of P2 is in the range of 8bar to 16bar, preferably 13bar in this example; the value of P3 is in the range of 34bar to 39bar, preferably 35bar in this example. Therefore, in this embodiment, the first preset interval is (31bar, 35bar), the second preset interval is [13bar, 31bar ], the third preset interval is [35bar, + ∞ ], and the fourth preset interval is (— infinity, 13 bar).
The exhaust pressure falls within the first preset interval, i.e., when the exhaust pressure is greater than 31bar and less than 35bar, it is determined that the exhaust pressure is higher, in which case the first theoretical adjustment amount is calculated from the exhaust pressure at that time.
Referring to fig. 2, fig. 2 is a block diagram illustrating a sub-step flow of step S102, where step S102 may include:
and a substep S1021, calculating the exhaust pressure minus a preset exhaust pressure target value to obtain an exhaust pressure difference value under the condition that the exhaust pressure falls into the first preset pressure interval.
It should be noted that the exhaust pressure target value needs to satisfy a lower limit value less than or equal to the first preset pressure interval, i.e., the exhaust pressure target value needs to be less than or equal to 35 bar. In practice, the target discharge pressure is between 28bar and 35bar, preferably 30bar in this embodiment.
And a substep S1022, calculating the product of the exhaust pressure difference and a preset first coefficient to obtain a first theoretical regulating quantity.
After the exhaust pressure difference is calculated through the substep S1021, the product of the exhaust pressure difference and a preset first coefficient is calculated to obtain a first theoretical regulating quantity. The first coefficient takes a value between 20 and 120, and the preferred value is 50 in the embodiment.
With continued reference to fig. 1, further, the external fan control method may further include:
and step S103, adjusting the rotating speed of an external fan of the air conditioner according to the first theoretical adjustment quantity.
In fact, after the first theoretical adjustment amount is obtained in step S102, a first actual adjustment amount needs to be obtained according to the first theoretical adjustment amount, and the first actual adjustment amount is the adjustment amount of the outer fan.
Referring to fig. 3, fig. 3 is a block diagram illustrating a sub-step flow of step S103, wherein step S103 may include:
and a substep S1031, comparing the first theoretical adjustment quantity with a plurality of preset first rotation speed intervals.
In the sub-step S1032, a first actual adjustment amount corresponding to the first rotation speed interval where the first theoretical adjustment amount is located is selected.
In this embodiment, the corresponding relationship between the first rotation speed interval and the first actual adjustment amount is shown in the following table:
for example, when the calculated first theoretical adjustment amount is greater than-200 rpm and less than or equal to-100 rpm, it falls within the (-150rpm, -100 rpm) interval, i.e., a first actual adjustment amount of-100 rpm corresponding to the (-150rpm, -100 rpm) interval is obtained.
And a substep S1033 of controlling the rotation speed of the outer fan to change the first actual adjustment amount.
In the above example, when the first actual adjustment amount is-100 rpm, the rotation speed of the external fan is controlled to be reduced by 100rpm, and when the first actual adjustment amount is 100rpm, the rotation speed of the external fan is controlled to be increased by 100 rpm.
Actually, in this embodiment, an adjustment period is preset, and the adjustment period takes a value between 30s and 300s, and in this embodiment, 60s is preferred. Namely, every time an adjustment cycle is 60s, a first theoretical adjustment amount needs to be calculated once according to the exhaust pressure acquired at that time, a first actual adjustment amount is acquired correspondingly according to the calculated first theoretical adjustment amount, and the rotating speed of the external fan is correspondingly adjusted once.
With continued reference to fig. 1, further, the external fan control method may further include:
and step S104, acquiring the heat exchange temperature difference of the outdoor heat exchanger under the condition that the exhaust pressure falls into a second preset pressure interval.
In this embodiment, the second preset pressure interval is [13bar, 31bar ], and when the real-time acquired exhaust pressure falls within the [13bar, 31bar ] interval, the representation of the exhaust pressure is moderate, in this case, the heat exchange temperature difference of the outdoor heat exchanger is a parameter for representing the effect of the outdoor heat exchanger, and the smaller the heat exchange temperature difference, the closer the refrigerant passing through the outdoor heat exchanger is to the outdoor environment temperature. Under the same condition, the smaller the heat exchange temperature difference is, the larger the air quantity of the external fan is needed, the larger the rotating speed is, and the larger the energy consumption is.
The heat exchange temperature difference refers to a difference value between defrosting temperature and outdoor environment temperature, and the defrosting temperature refers to the temperature of a refrigerant detected at a position in front of the shunt capillary of the outdoor heat exchanger, namely the temperature of the refrigerant after heat exchange of the outdoor heat exchanger.
Referring to fig. 4, fig. 4 is a block diagram illustrating a sub-step flow of step S104, where step S104 may include:
and a substep S1041 of respectively acquiring the outdoor environment temperature and the defrosting temperature of the outdoor heat exchanger under the condition that the exhaust pressure falls into a second preset pressure interval.
The outdoor environment temperature is obtained through a temperature sensor arranged outdoors, and the defrosting temperature is obtained through a temperature sensor arranged in front of a shunting capillary tube of the outdoor heat exchanger.
And the substep S1042 is used for calculating the defrosting temperature to subtract the corresponding outdoor environment temperature to obtain the heat exchange temperature difference.
With continued reference to fig. 1, further, the external fan control method may further include:
and step S105, calculating a second theoretical regulating quantity according to the heat exchange temperature difference.
Referring to fig. 5, fig. 5 is a block diagram illustrating a sub-step flow of step S105, wherein step S105 may include:
and a substep S1051 of obtaining a temperature difference target value.
In this embodiment, the target temperature difference target value is determined by the indoor temperature and the indoor set temperature of the air conditioner.
And a substep S1052, calculating the heat exchange temperature difference to subtract the temperature difference target value to obtain a temperature difference value.
And a substep S1053 of calculating the product of the temperature difference value and a preset second coefficient to obtain a second theoretical adjustment quantity.
The second coefficient takes a value in the range of 20 to 120, and in this embodiment, the preferred value is 50.
Referring to fig. 6, fig. 6 is a block flow diagram of a sub-step of the sub-step S1051, where the sub-step S1051 may include:
in the substep S1051a, the room temperature is acquired.
And acquiring indoor ambient temperature through an indoor temperature sensor to obtain indoor temperature.
And a substep S1051b of calculating the indoor temperature minus the set temperature of the air conditioner to obtain the indoor temperature difference.
In the substep S1051c, the indoor temperature difference is compared with a plurality of preset temperature intervals.
In the substep S1051d, a temperature difference target value corresponding to a temperature interval in which the indoor temperature difference is located is selected.
In this embodiment, the corresponding relationship between the temperature interval and the target temperature difference is shown in the following table:
when the indoor temperature difference is larger than a1, the difference between the indoor temperature and the set temperature is larger, and the performance requirement should be met firstly to ensure the quick heating effect. At the moment, a smaller temperature difference target value is set, and the rotating speed of the outdoor fan can be improved. And along with the reduction of the indoor temperature difference, when the indoor temperature is about to reach the set temperature, the output of the outdoor unit needs to be reduced, and the shutdown at the temperature is avoided. The rotating speed of the external fan is reduced by improving the target temperature difference value, so that the aims of reducing the output of the outdoor unit and improving the temperature control precision are fulfilled.
In the table, a2 takes a value between 0 ℃ and 4 ℃, and the preferred value in the embodiment is 2 ℃; a1 is selected at 3-6 deg.C, preferably 5 deg.C in this embodiment; b1, b2 and b3 all take values between 2 ℃ and 8 ℃, in the embodiment, b1 takes an optimal value of 5 ℃, b2 takes an optimal value of 4 ℃, and b3 takes an optimal value of 3 ℃.
For example, if the indoor temperature difference calculated in substep S1051b falls within the interval of (2 ℃, 5 ℃), the target temperature difference value is 4 ℃.
With continued reference to fig. 1, further, the external fan control method may further include:
and S106, adjusting the rotating speed of the external fan according to the second theoretical adjustment quantity.
Referring to fig. 7, fig. 7 is a block diagram illustrating a sub-step flow of step S106, where step S106 may include:
and a substep S1061 of comparing the second theoretical adjustment amount with a plurality of preset second rotation speed intervals.
And a substep S1062 of selecting a second actual adjustment quantity corresponding to a second rotation speed interval in which the second theoretical adjustment quantity is located.
In this embodiment, the corresponding relationship between the second rotation speed interval and the second actual adjustment amount is shown in the following table:
for example, when the calculated second theoretical adjustment amount is greater than-200 rpm and less than or equal to-100 rpm, it falls within the (-150rpm, -100 rpm) interval, i.e., a second actual adjustment amount of-100 rpm corresponding to the (-150rpm, -100 rpm) interval is obtained.
And a substep S1063 of controlling the rotating speed of the external fan to change the second actual regulating quantity.
And controlling the wind speed of the outer fan to be reduced by-100 rpm under the condition that the second actual regulating variable is obtained to be-100 rpm, and controlling the wind speed of the outer fan to be increased by 100rpm if the second actual regulating variable is obtained to be 100 rpm.
Similarly, in this embodiment, when the exhaust pressure falls within the second preset pressure interval, every time an adjustment period of 60s elapses, a second theoretical adjustment amount needs to be calculated according to the exhaust pressure obtained at that time, a second actual adjustment amount is obtained according to the calculated second theoretical adjustment amount, and the rotation speed of the external fan is adjusted once.
With continued reference to fig. 1, further, the external fan control method may further include:
and S107, controlling the outer fan to operate at the maximum rotating speed under the condition that the exhaust pressure falls into a third preset pressure interval.
That is, when the exhaust pressure falls within the range of [35bar, + ∞ ], it is determined that the exhaust pressure is too large, and in this case, the rotation speed of the outer fan is directly controlled to be increased to the maximum without being limited by the regulation period.
Further, the external fan control method may further include:
and step S108, controlling the outer fan to stop under the condition that the exhaust pressure falls into a fourth preset pressure interval.
That is, when the exhaust pressure falls within the range of (-infinity, 13bar), it is determined that the exhaust pressure is too low, and in this case, the external fan is directly controlled to stop without being limited by the adjustment cycle, thereby achieving the maximum energy saving.
Referring to fig. 8, fig. 8 shows an external fan control device 100 provided in this embodiment, where the external fan control device 100 is applied to an air conditioner, and in a process of operating the air conditioner at a low load, the external fan control device 100 can precisely adjust a rotation speed of an external fan on the premise of meeting an exhaust pressure requirement, so as to avoid energy waste. The outer fan control device 100 according to the present embodiment includes: an acquisition module 110, a calculation module 120, and an adjustment module 130.
The obtaining module 110 is configured to obtain an exhaust pressure of the air conditioner in real time. That is, the obtaining module 110 is configured to execute the steps S101,.
The calculating module 120 is configured to calculate a first theoretical adjustment amount according to the exhaust pressure when the exhaust pressure falls within a first preset pressure interval. That is, the computing module 120 is used for executing the step S102, the sub-step S1021 and the sub-step S1022 of the external fan control method.
And the adjusting module 130 is used for adjusting the rotating speed of the external fan of the air conditioner according to the first theoretical adjustment amount. That is, the adjusting module 130 is configured to execute step S103 of the aforementioned outer fan control method, and sub-step S1031, sub-step S1032, and sub-step S1033.
The obtaining module 110 is further configured to obtain a heat exchange temperature difference of the outdoor heat exchanger when the exhaust pressure falls within a second preset pressure interval. That is, the obtaining module 110 is further configured to perform step S104, and sub-steps S1041 and S1042 of the outer fan control method.
The calculation module 120 is further configured to calculate a second theoretical adjustment amount according to the heat exchange temperature difference. That is, the computing module 120 is further configured to perform the step S105, the sub-steps S1051, S1052, and S1053, and the sub-steps S1051a, S1051b, S1051c, and S1051d of the outer fan control method.
The adjusting module 130 is further configured to adjust the rotation speed of the external fan according to a second theoretical adjustment amount. The adjusting module 130 is further configured to perform step S106, and sub-steps S1061, S1062, and S1063 of the external fan control method.
The adjusting module 130 is further configured to control the outer fan to operate at the maximum speed if the exhaust pressure falls within a third predetermined pressure interval. That is, the adjusting module 130 is also used for executing step S107 of the aforementioned outer fan control method.
The adjusting module 130 is further configured to control the external blower to stop if the exhaust pressure falls within a fourth preset pressure interval. That is, the adjusting module 130 is also used for executing the step S108 of the aforementioned outer fan control method.
The present embodiment further provides an air conditioner, which includes a controller, the controller is used for the external fan control method of the foregoing steps S101 to S108, and a plurality of sub-steps corresponding to the steps. Therefore, the air conditioner can accurately adjust the rotating speed of the outer fan on the premise of meeting the requirement of the exhaust pressure, and energy waste is avoided.
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 (11)
1. An external fan control method is applied to an air conditioner and is characterized by comprising the following steps:
acquiring the exhaust pressure of the air conditioner in real time;
under the condition that the exhaust pressure falls into a first preset pressure interval, calculating a first theoretical regulating quantity according to the exhaust pressure;
adjusting the rotating speed of an outer fan of the air conditioner according to the first theoretical adjustment quantity;
under the condition that the exhaust pressure falls into a second preset pressure interval, acquiring a heat exchange temperature difference of the outdoor heat exchanger, wherein the upper limit value of the second preset pressure interval is equal to the lower limit value of the first preset pressure interval, and the heat exchange temperature difference refers to the difference between the defrosting temperature of the outdoor heat exchanger and the outdoor environment temperature;
calculating a second theoretical regulating quantity according to the heat exchange temperature difference;
and adjusting the rotating speed of the outer fan according to the second theoretical adjustment quantity.
2. The external blower control method according to claim 1, wherein the step of calculating a first theoretical adjustment amount based on the exhaust pressure in a case where the exhaust pressure falls within a first preset pressure interval includes:
under the condition that the exhaust pressure falls into a first preset pressure interval, calculating the exhaust pressure minus a preset exhaust pressure target value to obtain an exhaust pressure difference value, wherein the exhaust pressure target value is smaller than or equal to a lower limit value of the first preset pressure interval;
and calculating the product of the exhaust pressure difference and a preset first coefficient to obtain the first theoretical regulating quantity.
3. The external fan control method according to claim 1, wherein the step of adjusting the rotation speed of the external fan of the air conditioner according to the first theoretical adjustment amount comprises:
comparing the first theoretical regulating quantity with a plurality of preset first rotating speed intervals;
selecting a first actual regulating variable corresponding to the first rotating speed interval in which the first theoretical regulating variable is positioned;
and controlling the rotating speed of the outer fan to change the first actual regulating quantity.
4. The external fan control method according to claim 1, wherein the step of obtaining the heat exchange temperature difference of the outdoor heat exchanger when the exhaust pressure falls within a second preset pressure interval comprises:
under the condition that the exhaust pressure falls into the second preset pressure interval, respectively acquiring the outdoor environment temperature and the defrosting temperature of the outdoor heat exchanger;
and calculating the defrosting temperature minus the corresponding outdoor environment temperature to obtain the heat exchange temperature difference.
5. The external fan control method according to claim 1, wherein the step of calculating a second theoretical adjustment amount based on the heat exchange temperature difference comprises:
acquiring a temperature difference target value;
calculating the difference value of the temperature difference obtained by subtracting the target value of the temperature difference from the heat exchange temperature difference;
and calculating the product of the temperature difference value and a preset second coefficient to obtain the second theoretical regulating quantity.
6. The external fan control method according to claim 5, wherein the step of obtaining the temperature difference target value comprises:
acquiring indoor temperature;
calculating the indoor temperature minus the set temperature of the air conditioner to obtain the indoor temperature difference;
comparing the indoor temperature difference with a plurality of preset temperature intervals;
and selecting the temperature difference target value corresponding to the temperature interval where the indoor temperature difference is located.
7. The external fan control method according to claim 1, wherein the step of adjusting the rotation speed of the external fan according to the second theoretical adjustment amount includes:
comparing the second theoretical regulating quantity with a plurality of preset second rotating speed intervals;
selecting a second actual regulating variable corresponding to the second rotating speed interval in which the second theoretical regulating variable is positioned;
and controlling the rotating speed of the outer fan to change the second actual regulating quantity.
8. The external blower control method according to claim 1, further comprising, after the step of obtaining the discharge pressure of the air conditioner in real time:
and under the condition that the exhaust pressure falls into a third preset pressure interval, controlling the outer fan to operate at the maximum rotating speed, wherein the lower limit value of the third preset pressure interval is equal to the upper limit value of the first preset pressure interval.
9. The external blower control method according to claim 1, further comprising, after the step of obtaining the discharge pressure of the air conditioner in real time:
and under the condition that the exhaust pressure falls into a fourth preset pressure interval, controlling the outer fan to stop, wherein the upper limit value of the fourth preset pressure interval is equal to the lower limit value of the second preset pressure interval.
10. An external blower control device applied to an air conditioner, characterized in that the external blower control device (100) comprises:
the acquisition module (110) is used for acquiring the exhaust pressure of the air conditioner in real time;
the calculation module (120) is used for calculating a first theoretical regulating quantity according to the exhaust pressure under the condition that the exhaust pressure falls into a first preset pressure interval;
the adjusting module (130) is used for adjusting the rotating speed of an external fan of the air conditioner according to the first theoretical adjusting quantity;
the obtaining module (110) is further configured to obtain a heat exchange temperature difference of the outdoor heat exchanger when the exhaust pressure falls within a second preset pressure interval, where an upper limit value of the second preset pressure interval is equal to a lower limit value of the first preset pressure interval, and the heat exchange temperature difference refers to a difference between a defrosting temperature of the outdoor heat exchanger and an outdoor environment temperature;
the calculating module (120) is also used for calculating a second theoretical regulating quantity according to the heat exchange temperature difference;
the adjusting module (130) is further used for adjusting the rotating speed of the outer fan according to the second theoretical adjusting quantity.
11. An air conditioner comprising a controller for performing the external fan control method according to any one of claims 1 to 9.
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| CN113970167B (en) * | 2021-10-21 | 2022-10-11 | 珠海格力电器股份有限公司 | Air conditioner defrosting method, device, module, air conditioner and storage medium |
| CN115371230B (en) * | 2022-08-31 | 2024-09-10 | 南京天加环境科技有限公司 | Control method, system and medium for outdoor fan of air conditioner |
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Effective date of registration: 20221017 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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