CN117469191A - Variable frequency fan control method, device and unit - Google Patents
Variable frequency fan control method, device and unit Download PDFInfo
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- CN117469191A CN117469191A CN202311806242.5A CN202311806242A CN117469191A CN 117469191 A CN117469191 A CN 117469191A CN 202311806242 A CN202311806242 A CN 202311806242A CN 117469191 A CN117469191 A CN 117469191A
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- 238000004364 calculation method Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 description 9
- 230000004044 response Effects 0.000 description 7
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
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- 238000001514 detection method Methods 0.000 description 3
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- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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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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Abstract
The invention discloses a variable frequency fan control method, a variable frequency fan control device and a variable frequency fan unit. Wherein the method comprises the following steps: during the operation of the fan, determining a target deviation value according to the high-low pressure difference of the system; if the target deviation value is larger than N, the output frequency of the fan is increased, and then the frequency-increasing speed is controlled according to the actual load of the compressor; wherein N is the deviation setpoint; if the target deviation value is less than or equal to N, maintaining the output frequency of the fan; if the target deviation value is less than or equal to minus N, the output frequency of the fan is reduced, and then the frequency-reducing speed is controlled according to the high-voltage value of the system. According to the invention, the lifting frequency of the fan is judged by detecting the target deviation value, the lifting frequency speed of the fan is controlled according to the actual load of the compressor in the high-temperature working condition, and the lifting frequency speed of the fan is controlled according to the high-pressure value of the system in the low-temperature working condition, so that the operation reliability of the unit in the high-temperature and low-temperature working conditions can be ensured, and the energy efficiency of operation in other working conditions can be ensured.
Description
Technical Field
The invention relates to the technical field of variable frequency fans, in particular to a variable frequency fan control method, a variable frequency fan control device and a variable frequency fan unit.
Background
Conventional fan control detects the temperature at the condenser outlet, primarily through a temperature sensor, and communicates this signal to a controller. The controller controls the rotating speed of the fan according to the difference between the set temperature and the actual temperature, so as to adjust the air quantity of the fan.
The main purpose of conventional fan control schemes is to maintain the temperature at the condenser outlet within a set range to ensure proper operation and efficiency of the air conditioning system. Fluctuations in the condensation outlet temperature may occur due to changes in the ambient temperature and the influence of the condensation heat source. In addition, the traditional control method ignores the running state of the compressor, has a certain time difference in adjustment, and is easy to realize high-voltage protection or low-voltage protection.
Aiming at the problem of lower reliability of the unit running under the working condition of high temperature and low temperature under the conventional fan control scheme in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides a variable frequency fan control method, a variable frequency fan control device and a variable frequency fan unit, which are used for solving the problem that the reliability of the unit running under the working conditions of high temperature and low temperature in the conventional fan control scheme in the prior art is lower.
In order to solve the technical problems, the invention provides a variable frequency fan control method, which comprises the following steps: during the operation of the fan, determining a target deviation value according to the high-low pressure difference of the system; if the target deviation value is larger than N, the output frequency of the fan is increased, and then the frequency-increasing speed is controlled according to the actual load of the compressor; wherein N is the deviation setpoint; if the target deviation value is less than or equal to N, maintaining the output frequency of the fan; if the target deviation value is less than or equal to minus N, the output frequency of the fan is reduced, and then the frequency-reducing speed is controlled according to the high-voltage value of the system.
Further, determining a target deviation value according to the system high-low pressure difference comprises: the target deviation value=system high-low pressure difference-high-low pressure difference set value.
Further, raising the output frequency of the fan, and then controlling the raising speed according to the actual load of the compressor, including: raising the output frequency of the fan at a preset raising speed; then, the actual load of the compressor is periodically detected; if the actual load of the compressor is more than or equal to the load set value, the frequency raising speed of the fan is increased until the full frequency is reached; and if the actual load of the compressor is smaller than the load set value, maintaining the preset frequency raising speed.
Further, reducing the output frequency of the fan, and then controlling the frequency reducing speed according to the high-voltage value of the system, including: reducing the output frequency of the fan at a preset frequency-reducing speed; then, periodically detecting a system high-voltage value; if the system high-voltage value is less than or equal to the high-voltage set value, the frequency reduction speed of the fan is increased until the fan is closed; if the system high voltage value is greater than the high voltage set value, the preset frequency reducing speed is maintained.
Further, the method further comprises:
after the unit is started, starting a fan at a preset initial frequency; detecting the wet bulb temperature of the current outdoor environment; if the wet bulb temperature is less than or equal to T1, the fan is controlled to be turned off; if T1 is less than the wet bulb temperature is less than T2, controlling the fan to operate at a first preset frequency; if the wet bulb temperature is more than or equal to T2, controlling the fan to operate at a second preset frequency; wherein the first preset frequency is less than the second preset frequency, and T1 and T2 are preset values.
The invention also provides a variable frequency fan control device, wherein the device comprises:
the calculation module is used for determining a target deviation value according to the high-low pressure difference of the system during the operation of the fan;
the frequency raising module is used for raising the output frequency of the fan when the target deviation value is more than N, and then controlling the frequency raising speed according to the actual load of the compressor; wherein N is the deviation setpoint;
the stabilizing module is used for keeping the output frequency of the fan when the target deviation value of minus N is less than or equal to N;
the frequency reducing module is used for reducing the output frequency of the fan when the target deviation value is less than or equal to minus N, and then controlling the frequency reducing speed according to the high-voltage value of the system.
Further, the up-conversion module includes:
the frequency raising unit is used for raising the output frequency of the fan at a preset frequency raising speed; then, the actual load of the compressor is periodically detected; if the actual load of the compressor is more than or equal to the load set value, the frequency raising speed of the fan is increased until the full frequency is reached; and if the actual load of the compressor is smaller than the load set value, maintaining the preset frequency raising speed.
Further, the frequency reducing module includes:
the frequency reducing unit is used for reducing the output frequency of the fan at a preset frequency reducing speed; then, periodically detecting a system high-voltage value; if the system high-voltage value is less than or equal to the high-voltage set value, the frequency reduction speed of the fan is increased until the fan is closed; if the system high voltage value is greater than the high voltage set value, the preset frequency reducing speed is maintained.
The invention further provides a unit, wherein the unit comprises the variable frequency fan control device.
The invention also provides a computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements a method as described above.
The invention also provides an electronic device, which comprises:
one or more processors;
and storage means for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement a method as described above.
By adopting the technical scheme of the invention, the lifting frequency of the fan is judged by detecting the target deviation value, the lifting frequency speed of the fan is controlled according to the actual load of the compressor in the high-temperature working condition, and the lifting frequency speed of the fan is controlled according to the high-pressure value of the system in the low-temperature working condition, so that the running reliability of the unit in the high-temperature and low-temperature working conditions can be ensured, and the running energy efficiency in other working conditions can be ensured.
Drawings
FIG. 1 is a flow chart of a variable frequency fan control method according to an embodiment of the present invention;
FIG. 2 is a flow chart of overall fan control according to an embodiment of the present invention;
fig. 3 is a block diagram of a variable frequency fan control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the preset frequencies in embodiments of the present invention, these should not be limited to these terms. These terms are only used to distinguish between preset frequencies. For example, the first preset frequency may also be referred to as a second preset frequency, and similarly, the second preset frequency may also be referred to as a first preset frequency without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
According to an embodiment of the present invention, there is provided an embodiment of a variable frequency fan control method, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in an order different from that herein.
FIG. 1 is a flow chart of a variable frequency fan control method according to an embodiment of the invention, as shown in FIG. 1, comprising the steps of:
step S101, during the operation of a fan, determining a target deviation value according to the high-low pressure difference of the system;
wherein, the target deviation value=the system high-low pressure difference-high-low pressure difference set value.
The system high-low pressure difference is a system high pressure-system low pressure, the pressure value of the system high pressure is detected after the exhaust port of the compressor, and the pressure value of the system low pressure is detected before the suction port of the compressor.
Step S102, if the target deviation value is larger than N, the output frequency of the fan is increased, and then the frequency-increasing speed is controlled according to the actual load of the compressor; where N is the deviation setpoint, preferably N can take the value of 100kPa;
step S103, if the target deviation value is less than or equal to N, maintaining the output frequency of the fan;
and step S104, if the target deviation value is less than or equal to minus N, which means that the current low-temperature working condition exists, the output frequency of the fan is reduced, and then the frequency reduction speed is controlled according to the high-voltage value of the system.
According to the embodiment, the lifting frequency of the fan is judged by detecting the target deviation value, the lifting frequency speed of the fan is controlled according to the actual load of the compressor in a high-temperature working condition, and the lifting frequency speed of the fan is controlled according to the high-pressure value of the system in a low-temperature working condition, so that the running reliability of the unit in the high-temperature working condition and the low-temperature working condition can be ensured, and the running energy efficiency in other working conditions can be ensured.
After the system is started for a period of time, system parameters change, and the fan frequency is coarsely adjusted according to the target deviation value in order to adapt to the change. The target deviation value is directly related to the high-low pressure difference value, and the high-low pressure difference value is most directly related to the normal operation and the capacity energy efficiency of the compressor, so that the fan frequency is controlled in the mode, and the operation of the compressor can be effectively improved and ensured.
Considering that various parameters are dynamically changed during the operation of the system, the fan frequency can be readjusted at intervals in order to adapt to the change of the system. That is, the target deviation value is determined at intervals (for example, 3-5 seconds) according to the system high-low pressure difference, and the fan frequency is adjusted according to the target deviation value. Therefore, the fan frequency can be accurately and timely adjusted according to the running state of the system, and the stable and efficient running of the system can be ensured.
During the running process of the system, the condition of rapid change may occur. Under the high-temperature working condition, the compressor runs under high load, so that the condensation heat required to be released by the system is increased sharply, and if the system is at a conventional frequency-raising speed, the system cannot be stabilized rapidly. In view of the above, the present embodiment provides the following preferred embodiments: raising the output frequency of the fan at a preset raising speed; then, the actual load of the compressor is periodically detected; if the actual load of the compressor is more than or equal to the load set value (for example, the value can be 70%), the frequency raising speed of the fan is increased until the full frequency is reached; if the actual load of the compressor is less than the load set value, the preset frequency raising speed is maintained. Based on the method, the second-level adjustment is carried out on the frequency-increasing speed of the fan according to the actual load of the compressor, so that the compressor can be effectively protected, and the system operation is ensured.
Under the low temperature working condition, the compressor operates under low load, and if the high pressure value is rapidly reduced, the pressure difference is easily protected from being too low, so that the machine set is stopped. In view of the above, the present embodiment provides the following preferred embodiments: reducing the output frequency of the fan at a preset frequency-reducing speed; then, periodically detecting a system high-voltage value; if the system high-voltage value is less than or equal to the high-voltage set value (for example, the value can be 700-900 kPa), the frequency-reducing speed of the fan is increased until the fan is closed; if the system high voltage value is greater than the high voltage set value, the preset frequency reducing speed is maintained. Based on the method, the fan frequency-reducing speed is subjected to secondary regulation according to high-pressure, so that a compressor can be effectively protected, and the system operation is ensured. In conclusion, the fan frequency is finely adjusted, the rapid response system changes, and the stability of the system can be effectively improved.
For the adjustment of the fan frequency, except for the adjustment during the system operation, when the unit is started, the initial frequency of the fan needs to be controlled in order to ensure the efficient starting of the unit and the normal operation of the fan, and specifically, after the unit is started, the fan is started at the preset initial frequency; the wet bulb temperature of the current outdoor environment is detected. The unit condenser is installed in an outdoor environment, and the wet bulb temperature of the outdoor environment refers to the wet bulb temperature of the outdoor surrounding environment where the unit condenser is located. If the wet bulb temperature is less than or equal to T1, the fan is controlled to be closed; if T1 is less than wet bulb temperature is less than T2, controlling the fan to operate at a first preset frequency; if the wet bulb temperature is more than or equal to T2, controlling the fan to operate at a second preset frequency; wherein the first preset frequency is less than the second preset frequency, T1 and T2 are preset values, T1 can take a value between 10 and 15 ℃, and T2 can take a value between 30 and 35 ℃. According to the embodiment, the initial power of the fan is initially adjusted by comparing the ambient wet bulb temperature with the preset temperature, so that the starting efficiency of the unit is improved.
According to the embodiment, the frequency raising speed is controlled according to the load of the compressor under the high-temperature working condition, the frequency lowering speed is controlled according to the high-pressure value under the low-temperature working condition, and the output frequency of the fan is controlled through periodic detection and periodic adjustment. The problem of low reliability of operation of the unit under high-temperature and low-temperature working conditions in the conventional fan control method is solved, and the problem of low energy efficiency of operation of the unit under other working conditions in the conventional fan control method is solved.
Example 2
FIG. 2 is a flow chart of overall control of a fan according to an embodiment of the present invention, as shown in FIG. 2, including the steps of:
step S201, after the unit is started, an air conditioner water pump is started first. And (3) detecting whether the system gives an abnormal alarm or not before the compressor is started for A (5-10) seconds, detecting whether each protection logic acts or not, and starting the fan at a default frequency if the protection logic does not act. Based on the above, the cooling can be started in advance, the compressor is protected, and the normal operation of the unit is ensured.
And then executing fan start-stop and initial frequency control:
after the fan is started, the temperature of the ambient wet bulb is detected and compared with preset temperatures T1 and T2.
(1) If the wet bulb temperature is less than or equal to T1, the fan is turned off;
(2) if T1 is less than wet bulb temperature is less than T2, the fan operates at P2 frequency;
(3) if the wet bulb temperature is not less than T2, the fan operates at the frequency of P1. T1 can take on a value of 10-15 ℃, T2 can take on a value of 30-35 ℃, P1 can take on a value of 40-50Hz, and P2 can take on a value of 20-30Hz.
The fan power is preliminarily adjusted by comparing the ambient wet bulb temperature with the preset temperature, so that the starting efficiency of the unit can be improved.
Step S202, primary regulation of fan frequency: after a certain time B (e.g., 5-10) seconds of fan operation, the target deviation value is detected every C (e.g., 3-5) seconds and compared to the target deviation value set point N (e.g., 100 kPa), and the fan frequency is adjusted every D (e.g., 3-5) seconds. Wherein, the target deviation value= (high-low differential pressure value-high-low differential pressure set value).
(1) If the target deviation value is greater than N (for example, 100 kPa), the fan output frequency is increased;
(2) if N is less than the target deviation value and less than or equal to N (100 kPa), the output frequency of the fan is maintained;
(3) if the target deviation value is less than or equal to minus N, the output frequency is reduced.
After the unit is started for a period of time, system parameters can change, and in order to adapt to the change, the fan frequency is coarsely adjusted according to the target deviation value. The target deviation value is directly related to the high-low pressure difference value, and the high-low pressure difference value is most directly related to the normal operation and the capacity energy efficiency of the compressor, so that the fan frequency is controlled in the mode, and the operation of the compressor can be effectively improved and ensured.
During the running process of the system, various parameters are dynamically changed, and in order to adapt to the change of the system, the fan is readjusted at intervals. Specifically, the loop determination process is as follows:
during operation, the target bias is detected every C (e.g., 3-5) seconds. After each adjustment, the fan is operated at a frequency D (e.g., 3-5) seconds and after D (e.g., 3-5) seconds the target deviation value is compared with the deviation set point N again.
Thereafter, a secondary adjustment of the fan frequency is performed:
step S203, detecting the actual load of the compressor every C (e.g. 3-5) seconds when the fan is in the ascending state; if the actual load of the compressor is more than or equal to a load set value E (for example, 70%), the frequency raising speed of the fan is increased until the full frequency is reached; if the actual load of the compressor is less than the set value E, the normal frequency-raising speed (preset frequency-raising speed) is returned.
During the running process of the system, the condition of rapid change may occur. Under the high-temperature working condition, the compressor runs under high load, so that the condensation heat required to be released by the system is increased sharply; if the system is not stabilized quickly at the conventional frequency raising speed. Therefore, the second-level adjustment is carried out on the frequency-increasing speed of the fan according to the load of the compressor, so that the compressor can be effectively protected, and the system operation is ensured.
And S204, if the target deviation value of minus N is smaller than or equal to N, maintaining the output frequency of the fan.
In step S205, when the fan is in the down-conversion state, the system high voltage value is detected every C (e.g., 3-5) seconds. If the system high-voltage value is less than or equal to the high-voltage set value F (for example, 700-900 kPa), the frequency reduction speed of the fan is increased until the fan is closed; if the system high voltage value is greater than the high voltage set value F, the normal frequency reduction speed (preset frequency reduction speed) is returned.
Under the low temperature working condition, the compressor operates under low load, and if the high pressure value is rapidly reduced, the pressure difference is easily protected from being too low, so that the machine set is stopped. Therefore, the fan frequency-reducing speed is subjected to secondary regulation according to high-pressure, so that the compressor can be effectively protected, and the system operation is ensured. In conclusion, the fan frequency is finely adjusted, the rapid response system changes, and the stability of the system can be effectively improved.
Example 3
Corresponding to the variable frequency fan control method introduced in fig. 1, this embodiment provides a variable frequency fan control device, as shown in a structural block diagram of the variable frequency fan control device in fig. 3, where the device includes:
a calculating module 10, configured to determine a target deviation value according to a system high-low pressure difference during operation of the fan;
the frequency raising module 20 is connected to the calculation module 10 and is used for raising the output frequency of the fan when the target deviation value is greater than N, and then controlling the frequency raising speed according to the actual load of the compressor; wherein N is the deviation setpoint;
a stabilizing module 30, connected to the calculating module 10, for maintaining the output frequency of the blower when-N < the target deviation value is less than or equal to N;
the frequency reducing module 40 is connected to the calculating module 10 and is used for reducing the output frequency of the fan when the target deviation value is less than or equal to minus N, and then controlling the frequency reducing speed according to the high-voltage value of the system.
According to the embodiment, the lifting frequency of the fan is judged by detecting the target deviation value, the lifting frequency speed of the fan is controlled according to the actual load of the compressor in a high-temperature working condition, and the lifting frequency speed of the fan is controlled according to the high-pressure value of the system in a low-temperature working condition, so that the running reliability of the unit in the high-temperature working condition and the low-temperature working condition can be ensured, and the running energy efficiency in other working conditions can be ensured.
During the running process of the system, the condition of rapid change may occur. Under the high-temperature working condition, the compressor runs under high load, so that the condensation heat required to be released by the system is increased sharply, and if the system is at a conventional frequency-raising speed, the system cannot be stabilized rapidly. In view of the above, the present embodiment provides the following preferred embodiments: the up-conversion module 20 includes:
the frequency raising unit is used for raising the output frequency of the fan at a preset frequency raising speed; then, the actual load of the compressor is periodically detected; if the actual load of the compressor is more than or equal to the load set value, the frequency raising speed of the fan is increased until the full frequency is reached; if the actual load of the compressor is less than the load set value, the preset frequency raising speed is maintained.
Based on the method, the second-level adjustment is carried out on the frequency-increasing speed of the fan according to the actual load of the compressor, so that the compressor can be effectively protected, and the system operation is ensured.
Under the low temperature working condition, the compressor operates under low load, and if the high pressure value is rapidly reduced, the pressure difference is easily protected from being too low, so that the machine set is stopped. In view of the above, the present embodiment provides the following preferred embodiments: the frequency down-conversion module 40 includes:
the frequency reducing unit is used for reducing the output frequency of the fan at a preset frequency reducing speed; then, periodically detecting a system high-voltage value; if the system high-voltage value is less than or equal to the high-voltage set value, the frequency reduction speed of the fan is increased until the fan is closed; if the system high voltage value is greater than the high voltage set value, the preset frequency reducing speed is maintained.
Based on the method, the fan frequency-reducing speed is subjected to secondary regulation according to high-pressure, so that a compressor can be effectively protected, and the system operation is ensured. In conclusion, the fan frequency is finely adjusted, the rapid response system changes, and the stability of the system can be effectively improved.
The embodiment also provides a unit, which comprises the variable frequency fan control device. Specifically, the unit is a unit in which the condensing side is cooled by using a variable frequency fan.
Example 4
The embodiment provides an electronic device, which is used for a variable frequency fan control method, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
during the operation of the fan, determining a target deviation value according to the high-low pressure difference of the system; if the target deviation value is larger than N, the output frequency of the fan is increased, and then the frequency-increasing speed is controlled according to the actual load of the compressor; wherein N is the deviation setpoint; if the target deviation value is less than or equal to N, maintaining the output frequency of the fan; if the target deviation value is less than or equal to minus N, the output frequency of the fan is reduced, and then the frequency-reducing speed is controlled according to the high-voltage value of the system.
Example 5
The embodiment of the invention provides software for executing the technical scheme described in the embodiment and the preferred implementation mode.
The embodiment of the invention provides a nonvolatile computer storage medium, which stores computer executable instructions, and the computer executable instructions can execute the variable frequency fan control method in any of the method embodiments.
The above-described software is stored in the above-described storage medium including, but not limited to: optical discs, floppy discs, hard discs, erasable memory, etc.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The product can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present invention.
The electronic device of the embodiments of the present invention exists in a variety of forms including, but not limited to:
(1) Mobile communication devices, which are characterized by mobile communication functionality and are aimed at providing voice, data communication. Such terminals include smart phones (e.g., iPhone), multimedia phones, functional phones, and low-end phones, among others.
(2) Ultra mobile personal computer equipment, which belongs to the category of personal computers, has the functions of calculation and processing and generally has the characteristic of mobile internet surfing. Such terminals include PDA, MID and UMPC devices, etc., such as iPad.
(3) Portable entertainment devices such devices can display and play multimedia content. Such devices include audio, video players (e.g., iPod), palm game consoles, electronic books, and smart toys and portable car navigation devices.
(4) The server is similar to a general computer architecture in that the server is required to provide highly reliable services, and therefore, the server has high requirements in terms of processing capacity, stability, reliability, security, expandability, manageability and the like.
(5) Other electronic devices with data interaction function, such as televisions, vehicle-mounted large screens and the like.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for controlling a variable frequency fan, the method comprising:
after the unit is started, starting a fan at a preset initial frequency; detecting the wet bulb temperature of the current outdoor environment; if the wet bulb temperature is less than or equal to T1, the fan is controlled to be turned off; if T1 is less than the wet bulb temperature is less than T2, controlling the fan to operate at a first preset frequency; if the wet bulb temperature is more than or equal to T2, controlling the fan to operate at a second preset frequency; wherein the first preset frequency is less than the second preset frequency, and T1 and T2 are preset values;
during the operation of the fan, determining a target deviation value according to the high-low pressure difference of the system;
if the target deviation value is larger than N, the output frequency of the fan is increased, and then the frequency-increasing speed is controlled according to the actual load of the compressor; wherein N is the deviation setpoint;
if the target deviation value is less than or equal to N, maintaining the output frequency of the fan;
if the target deviation value is less than or equal to minus N, the output frequency of the fan is reduced, and then the frequency-reducing speed is controlled according to the high-voltage value of the system.
2. The method of claim 1, wherein determining the target bias value based on the system high-low differential pressure comprises:
the target deviation value=system high-low pressure difference-high-low pressure difference set value.
3. The method of claim 1, wherein increasing the output frequency of the blower and thereafter controlling the rate of increase according to the actual load of the compressor comprises:
raising the output frequency of the fan at a preset raising speed;
then, the actual load of the compressor is periodically detected;
if the actual load of the compressor is more than or equal to the load set value, the frequency raising speed of the fan is increased until the full frequency is reached;
and if the actual load of the compressor is smaller than the load set value, maintaining the preset frequency raising speed.
4. The method of claim 1, wherein reducing the output frequency of the blower and thereafter controlling the speed of the down-conversion based on the system high voltage value comprises:
reducing the output frequency of the fan at a preset frequency-reducing speed;
then, periodically detecting a system high-voltage value;
if the system high-voltage value is less than or equal to the high-voltage set value, the frequency reduction speed of the fan is increased until the fan is closed;
if the system high voltage value is greater than the high voltage set value, the preset frequency reducing speed is maintained.
5. A variable frequency fan control apparatus for implementing the variable frequency fan control method of any one of claims 1 to 4, the apparatus comprising:
the calculation module is used for determining a target deviation value according to the high-low pressure difference of the system during the operation of the fan;
the frequency raising module is used for raising the output frequency of the fan when the target deviation value is more than N, and then controlling the frequency raising speed according to the actual load of the compressor; wherein N is the deviation setpoint;
the stabilizing module is used for keeping the output frequency of the fan when the target deviation value of minus N is less than or equal to N;
the frequency reducing module is used for reducing the output frequency of the fan when the target deviation value is less than or equal to minus N, and then controlling the frequency reducing speed according to the high-voltage value of the system.
6. The apparatus of claim 5, wherein the up-conversion module comprises:
the frequency raising unit is used for raising the output frequency of the fan at a preset frequency raising speed; then, the actual load of the compressor is periodically detected; if the actual load of the compressor is more than or equal to the load set value, the frequency raising speed of the fan is increased until the full frequency is reached; and if the actual load of the compressor is smaller than the load set value, maintaining the preset frequency raising speed.
7. The apparatus of claim 5, wherein the frequency down module comprises:
the frequency reducing unit is used for reducing the output frequency of the fan at a preset frequency reducing speed; then, periodically detecting a system high-voltage value; if the system high-voltage value is less than or equal to the high-voltage set value, the frequency reduction speed of the fan is increased until the fan is closed; if the system high voltage value is greater than the high voltage set value, the preset frequency reducing speed is maintained.
8. A unit comprising a variable frequency fan control apparatus as claimed in any one of claims 5 to 8.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1 to 4.
10. An electronic device, comprising:
one or more processors;
storage means for storing one or more programs which when executed by the one or more processors cause the one or more processors to implement the method of any of claims 1 to 4.
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| CN115628530A (en) * | 2022-10-26 | 2023-01-20 | 珠海格力电器股份有限公司 | Fan control method, device and unit |
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| JPH0210048A (en) * | 1988-06-28 | 1990-01-12 | Matsushita Electric Ind Co Ltd | Frequency control device for air conditioner |
| EP1351029A2 (en) * | 2002-04-03 | 2003-10-08 | Linde Aktiengesellschaft | Method for controlling a set of compressors |
| CN104838214A (en) * | 2012-10-10 | 2015-08-12 | 特灵国际有限公司 | Variable fan speed control in hvac systems and methods |
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