CN113606737B - Fan rotating speed control method and device and air conditioner - Google Patents

Fan rotating speed control method and device and air conditioner Download PDF

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Publication number
CN113606737B
CN113606737B CN202110944894.XA CN202110944894A CN113606737B CN 113606737 B CN113606737 B CN 113606737B CN 202110944894 A CN202110944894 A CN 202110944894A CN 113606737 B CN113606737 B CN 113606737B
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Prior art keywords
fan
current
current amplitude
value
rotating speed
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CN113606737A (en
Inventor
游剑波
韩亚
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • 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
    • 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

Abstract

The invention provides a fan rotating speed control method and device and an air conditioner, and is applied to the technical field of air conditioners. The fan rotating speed control method comprises the following steps: acquiring a current amplitude value of the fan during the operation at the starting stage; controlling the rotating speed of the fan according to the current amplitude limit value to enable the current amplitude value not to exceed a first current amplitude limit value; acquiring a current amplitude value of a fan of an air conditioner during operation at a constant rotating speed stage; controlling the rotating speed of the fan according to the current amplitude value so that the current amplitude value of the fan does not exceed a second current amplitude limit value; wherein the first current clipping value is greater than the second current clipping value. The rotating speed of the fan is limited by adopting different current amplitude values in different operation stages, and the service life of the fan can be prolonged.

Description

Fan rotating speed control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling the rotating speed of a fan and an air conditioner.
Background
At present, the variable frequency air conditioner is widely applied to current life and production, and the current amplitude limiting value of a fan of an air conditioner outdoor unit during starting and running is generally I, namely the current amplitude of the fan is smaller than I in any period. However, at the moment of starting the fan, the electric energy cannot be instantly and completely converted into mechanical energy, so that the starting current is large and is approximately 0.8I. The current amplitude is typically approximately 0.3I at constant rotation. If the upwind is large, the load is large, so that the current of the fan is too large, the current amplitude is approximate to I, if the fan runs at a constant rotating speed for a long time, a coil of the fan can be heated, and finally the fan is burnt, so that the service life of the fan is short.
Disclosure of Invention
The invention solves the problem of how to prolong the service life of the fan.
In order to solve the problems, the invention provides a method and a device for controlling the rotating speed of a fan and an air conditioner.
In a first aspect, an embodiment of the present invention provides a method for controlling a rotational speed of a fan, which is applied to an air conditioner, and the method for controlling the rotational speed of the fan includes:
acquiring a current amplitude value of the fan in the operation of a starting stage;
controlling the rotating speed of the fan according to the current amplitude limit value to enable the current amplitude value not to exceed the first current amplitude limit value;
acquiring a current amplitude value of a fan of the air conditioner when the fan runs at a constant rotating speed stage;
controlling the rotating speed of the fan according to the current amplitude so that the current amplitude of the fan does not exceed a second current amplitude limit value; wherein the first current clipping value is greater than the second current clipping value.
In the embodiment of the invention, the rotating speed of the fan is controlled by adopting the first current amplitude limiting value in the starting stage of the fan, the rotating speed of the fan is controlled by adopting the second current amplitude limiting value in the constant rotating speed stage, and the rotating speed of the fan is limited by adopting different current amplitudes in different operation stages, so that the condition that the current is overlarge and even the fan is burnt out can be avoided in different stages due to different rotating speeds. The rotating speed of the fan is limited by adopting different current amplitude values in different operation stages, and the service life of the fan can be prolonged.
In an optional embodiment of the present invention, the step of controlling the rotation speed of the fan according to the current amplitude so that the current amplitude of the fan does not exceed a second current limit value includes:
judging whether the current amplitude is larger than or equal to a first current limiting value;
if the current amplitude is larger than or equal to the first current limiting value, acquiring the running time of the fan at the constant rotating speed stage when the current amplitude is larger than or equal to the first current limiting value;
judging whether the running time is greater than or equal to a preset time or not;
and if the running time is greater than or equal to the preset time, controlling the rotating speed of the fan to be reduced, so that the current amplitude of the fan does not exceed a second current amplitude limit value.
In an optional embodiment of the present invention, the step of controlling the rotation speed of the fan according to the current amplitude so that the current amplitude of the fan does not exceed a second current amplitude limit further includes:
and if the running time is less than the preset time, executing a step of obtaining the running time that the current amplitude of the fan is greater than or equal to the first current limiting value.
In an optional embodiment of the present invention, the step of controlling the rotation speed of the fan according to the current amplitude so that the current amplitude of the fan does not exceed a second current amplitude limit further includes:
and if the current amplitude is smaller than the first current limiting value, executing the step of obtaining the current amplitude when the fan of the air conditioner operates at the rated rotating speed stage.
In an optional embodiment of the present invention, after the step of controlling the rotation speed of the fan according to the current amplitude so that the current amplitude of the fan does not exceed a second current amplitude, the fan rotation speed control method further includes:
acquiring a real-time current amplitude of the fan after the rotating speed is reduced;
and controlling the rotating speed of the fan according to the real-time current amplitude and the second current amplitude limiting value, so that the fan can operate at a rated rotating speed.
In an optional embodiment of the present invention, the step of controlling the rotation speed of the fan according to the real-time current amplitude and the second current amplitude limit value so that the fan can operate at a rated rotation speed includes:
calculating the difference value of the second current limiting value and the real-time current amplitude value;
and if the difference value is greater than or equal to a preset difference value, controlling the fan to rotate at the rated rotating speed.
In an optional embodiment of the present invention, the step of controlling the rotation speed of the fan according to the real-time current amplitude and the second current amplitude limit value so that the fan can operate at a rated rotation speed includes:
and if the difference value is smaller than the preset difference value, controlling the rotating speed of the fan to be reduced.
In a second aspect, an embodiment of the present invention further provides a fan rotation speed control device, which is applied to an air conditioner, and the fan rotation speed control device includes:
the first current module is used for acquiring a current amplitude value of the fan during the operation in the starting stage;
the first control module is used for controlling the rotating speed of the fan according to a current amplitude limit value so that the current amplitude value does not exceed the first current amplitude limit value;
the second current module is used for acquiring the current amplitude of the fan of the air conditioner when the fan runs at a constant rotating speed stage;
the second control module is used for controlling the rotating speed of the fan according to the current amplitude value so that the current amplitude value of the fan does not exceed a second current limit value; wherein the first current clipping value is greater than the second current clipping value.
The beneficial effects of the fan speed control device provided by the second aspect are the same as those of the fan speed control method provided by the first aspect, and are not repeated here.
In a third aspect, an embodiment of the present invention provides an air conditioner, including a controller, where the controller is configured to execute a computer instruction to implement the method for controlling a rotation speed of a fan according to the first aspect.
The beneficial effects of the air conditioner provided by the third aspect are the same as those of the fan rotating speed control method provided by the first aspect, and are not described again here.
Drawings
Fig. 1 is a block diagram of an air conditioner according to an embodiment of the present invention.
Fig. 2 is a flowchart of a method for controlling a rotational speed of a fan according to an embodiment of the present invention.
Fig. 3 is a flowchart of steps S200 to S440 of a method for controlling a rotational speed of a fan according to an embodiment of the present invention.
Fig. 4 is a flowchart of step S510 and step S220 of the method for controlling a rotational speed of a fan according to the embodiment of the present invention.
Fig. 5 is a flowchart illustrating a sub-step of step S520 of a method for controlling a rotational speed of a fan according to an embodiment of the present invention.
Fig. 6 is a block diagram of a fan rotation speed control apparatus according to an embodiment of the present invention.
Description of reference numerals:
10-an air conditioner; 11-a controller; 12-a current detector; 13-a timer; 14-a fan; 20-a fan speed control device; 21-a first current module; 22-a first control module; 23-a second current module; 24-a second control 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.
Examples
Referring to fig. 1, the present embodiment provides a method and a device for controlling a rotational speed of a fan, which are applied to an air conditioner 10, and can avoid a phenomenon that the fan 14 is burned down as much as possible, thereby prolonging a service life of the fan 14.
At present, the variable frequency air conditioner is widely applied to current life and production, a current amplitude limit value of a fan 14 of an air conditioner outdoor unit during starting and running is generally I, that is, the current amplitude of the fan 14 is smaller than I in any period. However, at the moment of starting the fan 14, the electric energy cannot be completely converted into mechanical energy at the moment, so the starting current is large and is approximately 0.8I. The current amplitude is typically about 0.3I at constant rotation. If the upwind is large, the load is large, so that the current of the fan 14 is too large, the current amplitude is approximate to I, and if the fan 14 runs at a constant rotating speed for a long time, the coil of the fan 14 may be heated, and finally the fan 14 is burnt.
The air conditioner 10 comprises a controller 11, a current detector 12 and a timer 13, wherein the timer 13 and the current detector 12 are electrically connected with the controller 11, the timer 13 is used for detecting the running time of a fan 14 and the running time when the current amplitude of the fan 14 is larger than or equal to a first current limit value and sending the running time to the controller 11, the current detector 12 is used for detecting the current amplitude of the fan 14 at a rated rotating speed and the real-time current amplitude after the rotating speed is reduced and sending the current amplitude and the real-time current amplitude to the controller 11, and the controller 11 controls the rotating speed of the fan 14 through the current amplitude and the running time.
The method for controlling the rotating speed of the fan provided by the embodiment of the invention comprises the following specific steps:
referring to fig. 2, in step S100, the current amplitude of the fan 14 in the start-up phase is obtained.
After the fan 14 is started, the real-time rotation speed of the fan 14 is obtained, and when the real-time rotation speed is less than the rated rotation speed, the fan 14 is considered to be in a starting stage. Obtaining the current magnitude during the startup phase may monitor whether the current magnitude during the startup phase of the fan 14 is excessive.
Step S300, controlling the rotation speed of the fan 14 according to the first current amplitude limit value, so that the current amplitude does not exceed the first current amplitude limit value.
It will be readily appreciated that, without the other parameters being changed, the greater the speed of rotation of the fan 14, the greater the current amplitude, and conversely, the lower the speed of rotation of the fan 14, the lower the current amplitude. During the starting phase of the fan 14, the fan 14 needs to be limited, so as to avoid the fan 14 from being burnt out due to the excessive current amplitude.
The second current limiting amplitude is slightly smaller than the maximum current amplitude of the fan 14 in the starting process, and in order to ensure the normal operation of the fan 14, a certain margin is added on the basis of the maximum current amplitude, so that the second current limiting amplitude is slightly smaller than the maximum current amplitude.
In step S300, the current amplitude of the fan 14 of the air conditioner 10 during the operation in the constant rotation speed stage is obtained.
In the present embodiment, the operation of the fan 14 is generally divided into two phases, a start-up phase and a constant speed phase. During the constant speed phase, the fan 14 will generally be operating at the rated speed. Obtaining the current magnitude during the constant speed phase may monitor whether the current magnitude during constant speed operation of the fan 14 is excessive.
The rated rotation speed refers to a rotation speed corresponding to the current gear of the fan 14. If the current fan 14 is in the medium wind gear, the rotating speed corresponding to the medium wind gear is used as the rated rotating speed to operate, and similarly, if the current fan 14 is in the strong wind gear, the rotating speed corresponding to the strong wind gear is used as the rated rotating speed to operate.
Step S400, the rotation speed of the fan 14 is controlled according to the current amplitude and the operation time, so that the current amplitude of the fan 14 does not exceed the second current limit.
The second current limit value is a safe current limit value at which the fan 14 is continuously operated. The current amplitude of the fan 14 can be tested to drop every 50mA from 1A by simulating the severe working conditions, and whether the current waveform of the fan 14 is distorted or burnt is observed until a current limit value which can be operated for a long time without burning the fan 14 is found, wherein the current limit value is about 700mA at present.
In this embodiment, the rotation speed of the fan 14 is controlled according to the current amplitude and the running time, so that the current amplitude of the fan 14 does not exceed the second current limiting value, thereby ensuring that the fan 14 can run normally without burning, and prolonging the service life of the fan 14.
Referring to fig. 3, step S400 may include step S410, step S420, step S430 and step S440. Step S410, judging whether the current amplitude is larger than or equal to a first current limiting value;
in this embodiment, whether the current amplitude is greater than or equal to the first current amplitude limit value may be determined to determine whether the current amplitude is normal, if the current amplitude is smaller than the first current amplitude limit value, it may be considered that the current fan 14 is in a normal working state, and if the current amplitude is greater than or equal to the first current amplitude limit value, it may be considered that the current fan 14 is too large in current amplitude and may generate heat to cause a burnout condition.
In step S420, if the current amplitude is greater than or equal to the first current limiting value, the operation time that the current amplitude of the fan 14 is greater than or equal to the first current limiting value is obtained.
In this embodiment, if the current amplitude is greater than or equal to the first current amplitude limit value, it is indicated that the current amplitude of the fan 14 is larger, and if the current amplitude is long, the fan 14 may generate heat or even burn out, so that after the current amplitude is greater than or equal to the first current amplitude limit value, it is necessary to further determine the operation time when the current amplitude is greater than or equal to the first current amplitude limit value, so as to determine whether the fan 14 has a risk of burning out.
It will be readily appreciated that the run time is a fraction of the run time of the fan 14, and that step S420 may be considered a further definition of step S300, the run time being a fraction of the run time.
In step S430, it is determined whether the operation time is greater than or equal to a preset time.
Similarly, the preset time is slightly less than the limit time when the fan 14 runs at the first current limiting value and is burnt, the limit time refers to the situation that the fan 14 is burnt after the first current limiting value continues to work for the limit time, and the preset time is slightly less than the limit time and has a time margin, so that the situation that the fan 14 is burnt is avoided as far as possible, and the service life of the fan 14 is prolonged.
It is easy to understand that, determining the relationship between the operation time and the preset time may determine whether the current operating time of the fan 14 is longer, if the operation time is greater than or equal to the preset time, it may determine that the current amplitude of the current fan 14 is greater than or equal to the first current limiting value, and if the current operating time continues to be in the current state, the fan 14 may be burned. If the running time is less than the preset time, it can be determined that the running time when the current amplitude of the current fan 14 is greater than or equal to the first current limiting value is short, and there is no risk of burnout at present.
In the present embodiment, the step of obtaining the current amplitude when the fan 14 of the air conditioner 10 operates at the rated speed is performed if the current amplitude is smaller than the first current limiting value.
If the current amplitude is smaller than the first current limit value, it may be indicated that the current working state of the fan 14 is normal, and the current amplitude is not larger, the fan 14 may be controlled to keep the current rotating speed to continue to operate, and the step S200 is repeatedly executed.
In step S440, if the operation time is greater than or equal to the preset time, the rotation speed of the fan 14 is controlled to decrease, so that the current amplitude of the fan 14 does not exceed the second current limit value.
In this embodiment, if the operation time is greater than or equal to the preset time, it may be determined that the operation time when the current amplitude of the current fan 14 is greater than or equal to the first current limiting value is too long, and if the current fan continues to operate in the current state, the fan 14 may be burned. It is therefore desirable to reduce the current magnitude of the fan 14 so that the current magnitude does not exceed the second current limit value.
It is easy to understand that, under the condition that other parameters are not changed, the larger the rotating speed is, the larger the current amplitude is, and the smaller the rotating speed is, the smaller the current amplitude is, and the current amplitude of the fan 14 can be reduced by reducing the rotating speed of the fan 14, so that the current amplitude does not exceed the second current amplitude.
In this embodiment, if the operation time is less than the preset time, the step of obtaining the operation time when the current amplitude of the fan 14 is greater than or equal to the first current limiting value is performed.
If the running time is less than the preset time, it indicates that although the current amplitude is greater than or equal to the first current limiting value, the running time is short, the fan 14 does not generate heat seriously or even burn out, the current running state can be maintained to continue running, and the step S420 is executed to continue obtaining the running time.
Referring to fig. 4, in step S510, a real-time current amplitude of the fan 14 after the rotation speed is reduced is obtained.
The real-time current amplitude refers to a current amplitude at each moment in the working process of the fan 14 after the step S440 is executed, and the real-time current amplitude is continuously obtained after the step S440 is executed, so that whether the fan 14 can be operated at the rated rotation speed can be further judged through the real-time current amplitude.
Step S520, controlling the rotation speed of the fan 14 according to the real-time current amplitude and the second current amplitude limit value, so that the fan 14 can operate at the rated rotation speed.
In this embodiment, the rotation speed of the fan 14 is controlled according to the real-time current amplitude and the second current amplitude limiting value, so that the fan 14 can be kept to operate at the rated rotation speed for a long time period after the fan recovers the operation at the rated rotation speed, and a situation that the operation time when the current amplitude of the fan 14 is greater than or equal to the first current amplitude limiting value is greater than or equal to the preset time after the fan recovers the operation at the rated rotation speed can be avoided as much as possible, so that the step S440 is triggered again, so that the rotation speed of the fan 14 changes frequently, and the normal operation of the fan 14 is affected.
Referring to fig. 5, step S520 may include step S521, step S523 and step S525.
Step S521, calculating a difference between the real-time current amplitude and the second current limiting value.
In this embodiment, after the real-time current amplitude is obtained, a difference between the real-time current amplitude and the second current limit value is calculated. If the fan 14 is resumed to rotate at the rated rotation speed, a situation that the operation time that the current amplitude of the fan 14 is greater than or equal to the first current amplitude is greater than or equal to the preset time may still occur, so as to trigger step S340 again, and reduce the rotation speed of the fan 14 again.
If the difference value is larger, the current real-time current amplitude value is relatively smaller, if the fan 14 is restored to rotate at the rated rotating speed at the moment, because the current real-time current amplitude value is smaller, if the fan 14 is restored to rotate at the rated wind speed at the moment, the situation that the real-time current amplitude value is increased to exceed the first current limit amplitude value is small, and the fan 14 can normally operate at the rated rotating speed.
In step S522, it is determined whether the difference is greater than or equal to a predetermined difference.
If the difference is larger than or equal to the preset difference, the current real-time current amplitude is smaller, and if the motor is recovered to operate at the rated rotating speed, the situation that the real-time current amplitude reaches the second amplitude limit value is very small. If the difference is smaller than the preset difference, it is determined that the current real-time current amplitude is high, and the rotation speed of the fan 14 needs to be further reduced so as to reduce the real-time current amplitude. The rotation speed of the fan 14 is controlled by judging the relationship between the difference value and the preset difference value.
In step S523, if the difference is greater than or equal to the preset difference, the fan 14 is controlled to rotate at the rated rotation speed.
Typically, the predetermined difference is 60mA. If the difference is larger than or equal to the preset difference, the current real-time current amplitude is smaller, and if the motor is recovered to operate at the rated rotating speed, the situation that the real-time current amplitude reaches the second amplitude limit value is very small. And when the difference is greater than or equal to the preset difference, the fan 14 is controlled to recover the rated rotating speed to rotate, so that the fan 14 can keep a normal working state.
In step S525, if the difference is smaller than the preset difference, the rotation speed of the fan 14 is controlled to decrease.
In this embodiment, if the difference is smaller than the preset difference, it may be determined that the current real-time current amplitude is higher, and the rotation speed of the fan 14 needs to be further reduced to reduce the real-time current amplitude, so as to avoid the real-time current amplitude being too large.
The working principle of the fan rotating speed control method provided by the embodiment of the invention is as follows: in this embodiment, the real-time rotation speed of the fan 14 is controlled by the first current limiting value during the starting stage of the fan 14, so as to avoid the current amplitude from being too large. When the fan 14 is in a stable operation stage, after the current amplitude of the fan 14 is greater than or equal to the first current limiting value, obtaining the operation time that the current amplitude of the fan 14 is greater than or equal to the first current limiting value, when the operation time is greater than or equal to the preset time, controlling the rotation speed of the fan 14 to be reduced, so that the current amplitude is smaller than the second current limiting value, and when the difference between the real-time current amplitude and the second current limiting value is smaller than the preset difference, controlling the fan 14 to rotate at the rated rotation speed.
In summary, the fan rotation speed control method provided in the embodiment of the present invention controls the rotation speed of the fan 14 according to the current amplitude and the operation time, so that the current amplitude of the fan 14 does not exceed the second current limit value, thereby ensuring that the fan 14 can normally operate without burning, and thus prolonging the service life of the fan 14.
Referring to fig. 6, an embodiment of the present invention further provides a fan rotation speed control apparatus 20, where the fan rotation speed control apparatus 20 includes:
the first current module 21 is configured to obtain a current amplitude when the wind turbine is in a start-up phase.
Step S100 of the fan rotation speed control method provided in the embodiment of the present invention may be executed by the first current module 21.
And the first control module 22 is used for controlling the rotating speed of the fan according to the current amplitude limit value, so that the current amplitude value does not exceed the first current amplitude limit value.
Step S200 of the method for controlling the rotational speed of the fan according to the embodiment of the present invention may be executed by the first control module 22.
And the second current module 23 is configured to obtain a current amplitude when the fan of the air conditioner operates at a constant rotation speed stage.
Step S100 of the fan rotation speed control method provided in the embodiment of the present invention may be executed by the first current module 21.
The second control module 24 is configured to control the rotation speed of the fan according to the current amplitude, so that the current amplitude of the fan does not exceed a second current limit value; wherein the first current clipping value is greater than the second current clipping value.
Steps S400 to S525 of the method for controlling the rotational speed of the fan according to the embodiment of the present invention may be executed by the second control module 24.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Claims (8)

1. A fan speed control method applied to an air conditioner (10) is characterized in that the fan (14) speed control method comprises the following steps:
acquiring the current amplitude of the fan (14) in the operation of a starting stage;
controlling the rotating speed of the fan according to the current amplitude limit value to enable the current amplitude value not to exceed a first current amplitude limit value;
acquiring the current amplitude of a fan (14) of the air conditioner (10) in the stage of constant rotating speed operation;
controlling the rotation speed of the fan (14) according to the current amplitude value, so that the current amplitude value of the fan (14) does not exceed a second current limit value; wherein the first current clipping value is greater than the second current clipping value;
the step of controlling the rotation speed of the fan (14) according to the current amplitude value so that the current amplitude value of the fan (14) does not exceed a second current amplitude value comprises the following steps:
judging whether the current amplitude is larger than or equal to a first current limiting value or not;
if the current amplitude is larger than or equal to the first current amplitude limit value, acquiring the running time of the fan (14) in the constant rotating speed stage when the current amplitude is larger than or equal to the first current amplitude limit value;
judging whether the running time is greater than or equal to preset time or not;
and if the running time is greater than or equal to the preset time, controlling the rotating speed of the fan (14) to be reduced, so that the current amplitude of the fan (14) does not exceed a second current amplitude limit.
2. The method of controlling the rotational speed of the fan according to claim 1, wherein the step of controlling the rotational speed of the fan (14) in accordance with the magnitude of the current such that the magnitude of the current of the fan (14) does not exceed a second magnitude of current limit further comprises:
and if the running time is less than the preset time, executing a step of obtaining the running time when the current amplitude of the fan (14) is greater than or equal to the first current limiting value.
3. The fan speed control method according to claim 1, wherein the step of controlling the speed of the fan (14) in accordance with the current magnitude such that the current magnitude of the fan (14) does not exceed a second current magnitude limit further comprises:
and if the current amplitude is smaller than the first current limiting value, executing a step of acquiring the current amplitude when a fan (14) of the air conditioner (10) operates at a rated rotating speed stage.
4. The fan speed control method according to claim 1, wherein after the step of controlling the speed of the fan (14) in accordance with the current magnitude such that the current magnitude of the fan (14) does not exceed a second current magnitude limit, the fan (14) speed control method further comprises:
acquiring a real-time current amplitude of the fan (14) after the rotating speed is reduced;
and controlling the rotating speed of the fan (14) according to the real-time current amplitude and the second current amplitude limiting value, so that the fan (14) can operate at a rated rotating speed.
5. The method of claim 4, wherein the step of controlling the rotational speed of the fan (14) based on the real-time current amplitude and the second current amplitude limit value to enable the fan (14) to operate at a rated rotational speed comprises:
calculating the difference value of the second current limiting value and the real-time current amplitude value;
and if the difference value is greater than or equal to a preset difference value, controlling the fan (14) to rotate at the rated rotating speed.
6. The method of claim 5, wherein the step of controlling the rotational speed of the fan (14) based on the real-time current amplitude and the second current amplitude limit value to enable the fan (14) to operate at a rated rotational speed comprises:
and if the difference is smaller than the preset difference, controlling the rotating speed of the fan (14) to be reduced.
7. A fan speed control apparatus for an air conditioner (10), the fan speed control apparatus (20) comprising:
a first current module (21) for obtaining a current amplitude of the fan (14) during a start-up phase;
the first control module (22) is used for controlling the rotating speed of the fan according to a current amplitude limiting value, so that the current amplitude value does not exceed a first current amplitude limiting value;
the second current module (23) is used for acquiring the current amplitude of a fan (14) of the air conditioner (10) when the fan operates at a constant rotating speed stage;
a second control module (24) for controlling the rotational speed of the fan (14) in dependence on the current magnitude such that the current magnitude of the fan (14) does not exceed a second current limit value; wherein the first current clipping value is greater than the second current clipping value;
wherein the step of controlling the rotational speed of the fan (14) in dependence on the current magnitude such that the current magnitude of the fan (14) does not exceed a second current magnitude limit comprises:
judging whether the current amplitude is larger than or equal to a first current limiting value or not;
if the current amplitude is larger than or equal to the first current amplitude limit, acquiring the running time of the fan (14) at the constant rotating speed stage when the current amplitude is larger than or equal to the first current amplitude limit;
judging whether the running time is greater than or equal to preset time or not;
and if the running time is greater than or equal to the preset time, controlling the rotating speed of the fan (14) to be reduced, so that the current amplitude of the fan (14) does not exceed a second current amplitude limit value.
8. An air conditioner, characterized by comprising a controller (11), wherein the controller (11) is used for executing computer instructions to realize the fan (14) rotating speed control method according to any one of claims 1-6.
CN202110944894.XA 2021-08-17 2021-08-17 Fan rotating speed control method and device and air conditioner Active CN113606737B (en)

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