CN112984702B - Control method of fixed-frequency air conditioner, fixed-frequency air conditioner and storage medium - Google Patents
Control method of fixed-frequency air conditioner, fixed-frequency air conditioner and storage medium Download PDFInfo
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- CN112984702B CN112984702B CN202110329784.2A CN202110329784A CN112984702B CN 112984702 B CN112984702 B CN 112984702B CN 202110329784 A CN202110329784 A CN 202110329784A CN 112984702 B CN112984702 B CN 112984702B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- 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 control method of a fixed-frequency air conditioner, the fixed-frequency air conditioner and a storage medium, wherein the fixed-frequency air conditioner is started; acquiring the starting time and the closing time of an outdoor fan of the fixed-frequency air conditioner; when the duration of starting the outdoor fan reaches the starting duration, the outdoor fan is closed; when the continuous time for closing the outdoor fan reaches the closing time, detecting the temperature of a coil pipe of the fixed-frequency air conditioner; when the temperature of the coil pipe is higher than a set temperature, updating the opening duration and the closing duration according to a historical temperature difference; and starting the outdoor fan, and returning to execute the step of acquiring the starting time and the closing time of the outdoor fan of the fixed-frequency air conditioner, so that the comfort level of the user using the fixed-frequency air conditioner can be improved.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a control method of a fixed-frequency air conditioner, the fixed-frequency air conditioner and a storage medium.
Background
When the fixed-frequency air conditioner heats at an excessively high temperature, the system pressure can continuously rise and finally exceed a limit value to cause the fault of the fixed-frequency air conditioner, in order to avoid the fault of the fixed-frequency air conditioner, the outer fan and the compressor can be turned off under the condition that the temperature of the fixed-frequency air conditioner is excessively high to avoid the fault caused by the pressure exceeding the limit value, however, during the period of turning off the outer fan and the compressor, the fixed-frequency air conditioner stops heating, the indoor temperature is reduced, and the comfort level of a user is low.
Disclosure of Invention
The invention mainly aims to provide a control method of a fixed-frequency air conditioner, the fixed-frequency air conditioner and a storage medium, and aims to solve the technical problems that the fixed-frequency air conditioner stops heating and the indoor temperature is reduced and the comfort degree of a user is low during the period of turning off an external fan and a compressor.
In order to achieve the above object, the present invention provides a method for controlling a fixed-frequency air conditioner, comprising:
starting a fixed-frequency air conditioner;
acquiring the starting time and the closing time of an outdoor fan of the fixed-frequency air conditioner;
when the duration of starting the outdoor fan reaches the starting duration, closing the outdoor fan;
when the continuous time for closing the outdoor fan reaches the closing time, detecting the temperature of a coil pipe of the fixed-frequency air conditioner;
when the temperature of the coil pipe is higher than a set temperature, updating the opening time length and the closing time length according to a historical temperature difference, wherein the set temperature is the temperature of the coil pipe when the system pressure of the fixed-frequency air conditioner is normal, and the historical temperature difference is the difference between the temperature of the coil pipe detected in the past after the fixed-frequency air conditioner is opened and the set temperature;
and starting the outdoor fan, and returning to execute the step of acquiring the starting time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
In one embodiment, the step of updating the on-time and the off-time based on the historical temperature difference comprises:
updating the starting time according to the historical temperature difference and the last starting duration of the outdoor fan;
and updating the closing time length according to the updated opening time length.
In an embodiment, the step of updating the starting duration according to the historical temperature difference and the last starting duration of the outdoor fan includes:
determining an opening time length proportion according to the historical temperature difference and the last opening time length of the outdoor fan, wherein the opening time length proportion is the ratio of the opening time length to the set total switching time length of the outdoor fan, and the set total switching time length is the total time length of the outdoor fan which is continuously closed once after being continuously opened once;
and updating the opening duration according to the opening duration proportion.
In an embodiment, the historical temperature difference includes three temperature differences with the latest time for detecting the temperature of the coil, and the step of determining the proportion of the turn-on duration according to the historical temperature difference and the last turn-on duration of the outdoor fan includes:
determining a target ratio of the last starting duration of the outdoor fan to the set total switching duration;
determining the opening time length proportion according to the historical temperature differences, the target ratio and a preset mapping relation, wherein the preset mapping relation is the mapping relation of the historical temperature differences, the target ratio and the opening time length proportion, and parameters of the preset mapping relation comprise a preset proportionality coefficient, a preset integral coefficient and a preset differential coefficient.
In an embodiment, after the step of detecting the temperature of the coil of the fixed-frequency air conditioner, the method further includes:
when the temperature of the coil pipe is less than or equal to the set temperature, starting the outdoor fan and controlling the outdoor fan to maintain a starting state;
detecting the temperature of a coil pipe of the fixed-frequency air conditioner at fixed time;
and when the temperature of the coil pipe is detected to be higher than the set temperature, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
In one embodiment, the step of turning on the outdoor fan and controlling the outdoor fan to maintain the on state when the temperature of the coil is less than or equal to the set temperature includes:
when the temperature of the coil pipe is less than or equal to the set temperature, acquiring indoor temperature;
and when the indoor temperature is greater than or equal to the set indoor temperature, starting the outdoor fan and controlling the outdoor fan to maintain the starting state.
In an embodiment, after the step of turning on the fixed-frequency air conditioner, the method further includes:
and when the fixed-frequency air conditioner is detected to be in a heating mode, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
In an embodiment, after the step of turning on the fixed-frequency air conditioner, the method further includes:
and when detecting that the temperature of the coil pipe of the fixed-frequency air conditioner is greater than the set temperature, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
In addition, in order to achieve the above object, the present invention further provides a fixed-frequency air conditioner, which includes a memory, a processor, and a control program of the fixed-frequency air conditioner that is stored in the memory and is executable on the processor, wherein the control program of the fixed-frequency air conditioner, when executed by the processor, implements the steps of any one of the control methods of the fixed-frequency air conditioner.
In addition, to achieve the above object, the present invention further provides a computer-readable storage medium having a control program of a fixed-frequency air conditioner stored thereon, wherein the control program of the fixed-frequency air conditioner, when executed by a processor, implements the steps of the control method of the fixed-frequency air conditioner according to any one of the above aspects.
The invention provides a control method of a fixed frequency air conditioner, the fixed frequency air conditioner and a storage medium, which are characterized in that after the fixed frequency air conditioner is started, the opening time and the closing time of an outdoor fan of the fixed frequency air conditioner are obtained, when the duration of the outdoor fan is up to the opening time, the outdoor fan is closed, when the duration of the outdoor fan is up to the closing time, the coil temperature of the fixed frequency air conditioner is detected, when the coil temperature is higher than the set temperature, the opening time and the closing time are updated according to the historical temperature difference, the outer fan is started, the opening time and the closing time of the fixed frequency air conditioner are obtained in a return mode, wherein after the fixed frequency air conditioner is started, the outdoor fan is only started and closed in the whole control process, a compressor is always in an opening state, therefore, the fixed frequency air conditioner can continuously output heat to the indoor, the comfort of a user is higher, on the other hand, in order to avoid that the pressure of the fixed frequency air conditioner is too high, after the air conditioner is started, the outdoor fan is periodically started and closed, the temperature of the outdoor fan is reduced during the closing period, the operation process, the temperature of the fan is controlled by combining the historical temperature difference and the historical temperature difference of the historical temperature of the outdoor fan, the original temperature is detected, and the pressure difference of the outdoor fan is dynamically adjusted, thereby make the coil pipe temperature reach below the settlement temperature gradually, and with system's pressure adjustment to the pressure when normal to avoided closing outer fan and compressor, leaded to the fixed frequency air conditioner to stop heating, the indoor temperature descends, the lower problem of user's comfort level, can be under the normal circumstances of system's pressure that makes the fixed frequency air conditioner, continuously to indoor output heat, promote user's comfort level.
Drawings
Fig. 1 is a schematic structural diagram of a fixed-frequency air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a control method of a fixed-frequency air conditioner according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second embodiment of a method for controlling a fixed-frequency air conditioner according to the present invention;
fig. 4 is a flowchart illustrating a control method of a fixed-frequency air conditioner according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a fixed-frequency air conditioner according to an embodiment of the present invention.
As shown in fig. 1, the fixed-frequency air conditioner may include: a processor 1001, such as a CPU, a memory 1002, and a communication bus 1003. The communication bus 1003 is used to implement connection communication among these components. The memory 1002 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 1002 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the fixed frequency air conditioner shown in fig. 1 does not constitute a limitation of the fixed frequency air conditioner, and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1002, which is a kind of computer storage medium, may include therein an operating system and a control program of the constant-frequency air conditioner.
In the fixed-frequency air conditioner shown in fig. 1, the processor 1001 may be configured to call a control program of the fixed-frequency air conditioner stored in the memory 1002, and perform the following operations:
starting a fixed-frequency air conditioner;
acquiring the starting time and the closing time of an outdoor fan of the fixed-frequency air conditioner;
when the duration of starting the outdoor fan reaches the starting duration, the outdoor fan is closed;
when the continuous time for closing the outdoor fan reaches the closing time, detecting the temperature of a coil pipe of the fixed-frequency air conditioner;
when the temperature of the coil pipe is higher than a set temperature, updating the opening time length and the closing time length according to a historical temperature difference, wherein the set temperature is the temperature of the coil pipe when the system pressure of the fixed-frequency air conditioner is normal, and the historical temperature difference is the difference between the temperature of the coil pipe detected in the past after the fixed-frequency air conditioner is opened and the set temperature;
and starting the outdoor fan, and returning to execute the step of obtaining the starting time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
Further, the processor 1001 may call the control program of the fixed-frequency air conditioner stored in the memory 1002, and further perform the following operations:
updating the starting time according to the historical temperature difference and the last starting duration of the outdoor fan;
and updating the closing time length according to the updated opening time length.
Further, the processor 1001 may call the control program of the fixed-frequency air conditioner stored in the memory 1002, and further perform the following operations:
determining an opening time length proportion according to the historical temperature difference and the last opening time length of the outdoor fan, wherein the opening time length proportion is the ratio of the opening time length to the set total switching time length of the outdoor fan, and the set total switching time length is the total time length of the outdoor fan which is continuously closed once after being continuously opened once;
and updating the opening duration according to the opening duration proportion.
Further, the processor 1001 may call the control program of the fixed-frequency air conditioner stored in the memory 1002, and further perform the following operations:
determining a target ratio of the last starting duration of the outdoor fan to the set total switching duration;
determining the opening time length proportion according to each historical temperature difference, the target ratio and a preset mapping relation, wherein the preset mapping relation is the mapping relation of the historical temperature difference, the target ratio and the opening time length proportion, and parameters of the preset mapping relation comprise a preset proportional coefficient, a preset integral coefficient and a preset differential coefficient.
Further, the processor 1001 may call the control program of the fixed-frequency air conditioner stored in the memory 1002, and further perform the following operations:
when the temperature of the coil pipe is less than or equal to the set temperature, starting the outdoor fan and controlling the outdoor fan to maintain a starting state;
detecting the temperature of a coil pipe of the fixed-frequency air conditioner at fixed time;
and when the temperature of the coil pipe is detected to be higher than the set temperature, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
Further, the processor 1001 may call the control program of the fixed-frequency air conditioner stored in the memory 1002, and further perform the following operations:
when the temperature of the coil pipe is less than or equal to the set temperature, acquiring indoor temperature;
and when the indoor temperature is greater than or equal to the set indoor temperature, starting the outdoor fan and controlling the outdoor fan to maintain the starting state.
Further, the processor 1001 may call a control program of the constant-frequency air conditioner stored in the memory 1002, and further perform the following operations:
and when the fixed-frequency air conditioner is detected to be in a heating mode, executing the step of acquiring the opening duration and the closing duration of an outdoor fan of the fixed-frequency air conditioner.
Further, the processor 1001 may call the control program of the fixed-frequency air conditioner stored in the memory 1002, and further perform the following operations:
and when detecting that the temperature of the coil pipe of the fixed-frequency air conditioner is greater than the set temperature, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
Referring to fig. 2, a first embodiment of the present invention provides a method for controlling a fixed-frequency air conditioner, including:
step S10, starting a fixed-frequency air conditioner;
in the embodiment, the execution subject is a constant-frequency air conditioner; the fixed frequency air conditioner is an air conditioner equipment with unchangeable power supply frequency, the fixed frequency air conditioner can avoid the system pressure from being overlarge by continuously opening and closing a compressor, and the compressor does not output heat to the indoor during the closing period, so that for an indoor user, the heat is sometimes and sometimes unstable in temperature, and the comfort level is low.
The method comprises the steps that the fixed-frequency air conditioner is started in various ways, the fixed-frequency air conditioner comprises an outdoor fan and a compressor, and after the fixed-frequency air conditioner is started, the outdoor fan and the compressor are started by default and are kept running; the method for starting the fixed-frequency air conditioner is not limited, and the fixed-frequency air conditioner can be automatically started at fixed time, or the interactive behavior of the user for starting the air conditioner is detected, and the starting operation is executed.
In addition, the fixed-frequency air conditioner is provided with a heating mode and a cooling mode, the on-time and the off-time of an outdoor fan of the fixed-frequency air conditioner can be obtained only when the fixed-frequency air conditioner is detected to be in the heating mode, the running mode of the fixed-frequency air conditioner can be detected at regular time after the fixed-frequency air conditioner is started, the step of obtaining the on-time and the off-time and the subsequent steps are not executed when the fixed-frequency air conditioner is in the cooling mode, and the step of obtaining the on-time and the off-time and the subsequent steps are executed when the running mode is detected to be in the heating mode.
After the fixed-frequency air conditioner is started, the temperature of the coil of the fixed-frequency air conditioner can be directly detected at regular time, and when the temperature of the coil of the fixed-frequency air conditioner is detected to be higher than the set temperature, the step S20 is executed.
Step S20, acquiring the starting time and the closing time of an outdoor fan of the fixed-frequency air conditioner;
the opening duration is the duration for enabling the fixed-frequency air conditioner to maintain the opening state, and the closing duration is the duration for enabling the fixed-frequency air conditioner to maintain the closing state.
After the fixed-frequency air conditioner is started, the operation of obtaining the starting time length and the closing time length of the outdoor fan of the fixed-frequency air conditioner can be directly executed by default, or the operation of obtaining the starting time length and the closing time length can be executed after other conditions are detected to be met after the fixed-frequency air conditioner is started; for example, after the fixed-frequency air conditioner is started, the starting time and the closing time of the fixed-frequency air conditioner are directly obtained, at this time, because the fixed-frequency air conditioner is started for the first time, the system pressure of the fixed-frequency air conditioner is not too large, the outdoor fan can be in a starting state as much as possible, based on the starting time and the closing time, the starting time can be increased as much as possible, and the closing time can be reduced as much as possible, wherein if the closing time is set to be 0, the closing operation is not performed after the outdoor fan is started for a period of time, the temperature of the coil is detected, the subsequent operation is executed, and under the condition that the temperature of the coil is too high, the starting time and the closing time can be updated, and the outdoor fan is further started and closed; for another example, after the fixed-frequency air conditioner is started, the step of acquiring the starting duration and the closing duration is not directly executed, but a period of time is timed firstly, and after the timing of the period of time is finished, the step of acquiring the starting duration and the closing duration is executed; for another example, after the fixed-frequency air conditioner is turned on, whether the system pressure is too high can be detected, and the step of obtaining the on-time and the off-time is executed under the condition that the pressure is too high, in this case, the first on-time and the first off-time can be set according to data measured in a laboratory, for example, the on-time is set to be 1s, and the off-time is set to be 9s; in addition, the opening duration and the closing duration may be set to different values according to requirements, and are not limited herein.
Step S30, when the duration of starting the outdoor fan reaches the starting duration, the outdoor fan is closed;
after the fixed-frequency air conditioner is started, the outdoor fan is in a starting state, the duration for starting the outdoor fan can be the duration from the first time for starting the outdoor fan to the current time, in addition, the duration can also be the duration from a certain specific time point after the outdoor fan is started to the current time, the specific time point can also be in a corresponding relation with the starting duration, for example, if the duration is calculated, the time point with the overhigh system pressure is taken as the specific time point, and the duration from the time point with the overhigh system pressure to the current time is calculated, then the starting duration is the preset corresponding starting duration under the condition that the system pressure is overhigh, namely the starting duration can be set to 1s, and under the condition that the system pressure is overhigh, the outdoor fan is closed after the outdoor fan is kept being started for 1s.
S40, detecting the temperature of a coil pipe of the fixed-frequency air conditioner when the continuous time for closing the outdoor fan reaches the closing time;
after the outdoor fan is closed, the temperature of the outdoor fan in a closed state is reduced, so that the pressure of a system can be reduced, the duration for closing the outdoor fan is the time length from the time point for closing the outdoor fan to the current time point, and the system pressure is changed after the outdoor fan is opened and closed every time, at the moment, the fixed-frequency air conditioner judges whether the next process of opening and closing the outdoor fan is needed, namely whether the system pressure is too high or not, and the specific mode is that the temperature of a coil is detected, and the system pressure is indicated to be too high under the condition that the temperature of the coil is too high, so that the system pressure is judged to be high in efficiency; when the coil temperature is detected to be low, for example, the coil temperature is less than or equal to the set temperature, it indicates that the system pressure is normal, and at this time, the system enters a normal control mode, and the outdoor fan is maintained in an on state.
Step S50, when the temperature of the coil pipe is higher than a set temperature, updating the opening time length and the closing time length according to a historical temperature difference, wherein the set temperature is the temperature of the coil pipe when the system pressure of the fixed-frequency air conditioner is normal, and the historical temperature difference is a difference value between the coil pipe temperature detected in the past after the fixed-frequency air conditioner is opened and the set temperature;
the set temperature is the temperature of the coil pipe when the system pressure of the fixed-frequency air conditioner is normal, the values of the system pressure corresponding to different coil pipe temperatures can be measured in a laboratory in advance, the value of the coil pipe temperature of which the system pressure is at a normal and abnormal critical point is determined as the set temperature, the historical temperature difference is the difference value between the coil pipe temperature detected in the past and the set temperature after the fixed-frequency air conditioner is started, the past can refer to one time or more times, and the number of the historical temperature differences can be one or more.
In the embodiment, in the whole process of reducing the system pressure, the outdoor fan is not mechanically turned on and off according to the same turning-on duration and turning-off duration, but the next process of regulating the system pressure is performed in combination with the historical condition of regulating the system pressure, that is, the turning-on duration and the turning-off duration are updated according to the historical temperature difference, the outdoor fan is turned on again, the duration for continuously turning on the outdoor fan and the duration for continuously turning off the outdoor fan are controlled according to the updated turning-on duration and turning-off duration, and the turning-on duration and the turning-off duration are updated by continuously controlling the turning-on and the turning-off of the outdoor fan, so that the technical effect of reducing the system pressure can be achieved.
And S60, starting the outdoor fan, and returning to execute the step of acquiring the starting time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
And after the opening time and the closing time are updated, the outdoor fan is started again, the step of obtaining the opening time and the closing time of the fixed-frequency air conditioner is executed again, the outdoor fan can be continuously controlled to be opened and closed as long as the system pressure is overhigh and the temperature of the coil is higher than the set temperature, and the outdoor fan can be continuously opened until the temperature of the coil is lower than or equal to the set temperature.
In the embodiment, after the fixed-frequency air conditioner is started, the starting time and the closing time of the outdoor fan of the fixed-frequency air conditioner are obtained, when the continuous time for starting the outdoor fan reaches the starting time, the outdoor fan is closed, when the continuous time for closing the outdoor fan reaches the closing time, the coil temperature of the fixed-frequency air conditioner is detected, when the coil temperature is greater than the set temperature, the starting time and the closing time are updated according to the historical temperature difference, the outer fan is started, and the starting time and the closing time of the fixed-frequency air conditioner are obtained by returning, wherein after the fixed-frequency air conditioner is started, only the outdoor fan is started and closed in the whole control process, the compressor is always in the starting state, therefore, the fixed-frequency air conditioner can continuously output heat to the indoor, so that the comfort level of a user is high, on the other hand, in order to avoid the overlarge pressure of the fixed-frequency air conditioner, the invention periodically opens and closes the outdoor fan after the air conditioner is started, the temperature of the outdoor fan is reduced during the closing period, thereby avoiding the system pressure rise caused by the operation process of the outdoor fan, on the basis, the opening time length and the closing time length are dynamically controlled by combining the historical temperature difference, the historical temperature difference is the difference value between the coil temperature detected in the past after the fixed frequency air conditioner is started and the set temperature, the set temperature is the temperature of the coil when the system pressure of the fixed frequency air conditioner is normal, thereby being capable of representing the pressure change condition in the historical adjusting process by the historical temperature difference, updating the time length of opening and closing the outdoor fan for the next time on the basis of the temperature difference, and controlling the opening and closing of the outdoor fan for the next time, thereby leading the coil temperature to gradually reach below the set temperature, and adjust system pressure to the pressure when normal to avoided closing outer fan and compressor, leaded to the fixed frequency air conditioner to stop heating, indoor temperature descends, the lower problem of user's comfort level, can be under the condition that make the system pressure of fixed frequency air conditioner normal, continuously to indoor output heat, promoted user's comfort level.
Referring to fig. 3, a second embodiment of the present invention provides a method for controlling a constant-frequency air conditioner, where based on the first embodiment shown in fig. 2, the step S50 includes:
step S51, when the temperature of the coil pipe is higher than a set temperature, updating the starting time according to the historical temperature difference and the last starting duration of the outdoor fan;
the purpose of updating the starting time length is to determine the time length for continuously starting the outdoor fan which is controlled next time, more accurately determine the next starting time length and realize more accurate adjustment of the system pressure, and therefore, the embodiment adopts an incremental PID control method to update the next starting time length on the basis of the last starting time length; the first time the outdoor fan is turned on and the first time the outdoor fan is turned off may be preset default values.
In this embodiment, the process of turning on and off the outdoor fan each time is regarded as a period, and the time length of each period is the same, for example, each period is set to 10s; before the starting time length is determined, the starting time length proportion can be determined according to the historical temperature difference and the last starting duration of the outdoor fan, the starting time length proportion is the ratio of the starting time length to the set total switching time length of the outdoor fan, the set total switching time length is the total time length of the outdoor fan which is continuously turned off after being continuously turned on once, and the set total time length is a fixed value and can be regarded as the time length of a period; after the opening time length proportion is determined, the opening time length is updated according to the opening time length proportion, for example, the total set time length is 10s, the opening time length proportion is 0.11, and the opening time length is updated to 1.1s.
When the starting time length proportion is determined, an incremental PID control method is adopted in the embodiment, the proportion of the last starting time length needs to be determined, that is, the target ratio of the last starting time length of the outdoor fan to the set total switching time length is determined, then, the starting time length proportion is determined according to each historical temperature difference, the target ratio and the preset mapping relation, the preset mapping relation is the mapping relation of the historical temperature difference, the target ratio and the starting time length proportion, the parameters of the preset mapping relation comprise a preset proportional coefficient, a preset integral coefficient and a preset differential coefficient, in the embodiment, the historical temperature difference comprises the historical temperature difference of the previous three times, that is, when the starting time length proportion needs to be determined, the historical temperature difference sampled before the previous time is obtained from a memory, that is, the historical temperature difference of the latest three times of the sampling time, and the sampling time refers to the time of the sampling temperature difference, so that the starting time length proportion is calculated.
Setting the opening time length proportion as Uf, setting the historical temperature difference as E0, E1 and E2 from latest to earliest according to the sampling time, namely E0 is the historical temperature difference obtained by the latest sampling, E2 is the historical temperature difference obtained by the earliest sampling, E0, E1 and E2 are adjacent in time, and setting the last opening duration of the outdoor fan as Uf1, then:
Uf＝(Pk*(E0-E1)+Ki*E0+Kd*(E0-2*E1+E2))+Uf1；
the method comprises the following steps of (1) determining the performance of each group of coefficients in the whole system pressure adjusting process, wherein Pk is a preset proportionality coefficient, ki is a preset integral coefficient, and Kd is a preset differential coefficient, wherein the preset proportionality coefficient, the preset integral coefficient and the preset differential coefficient can be determined in advance in a laboratory, and the determination mode can be realized by setting a plurality of groups of different preset proportionality coefficients, preset integral coefficients and preset differential coefficients, determining the performance of each group of coefficients in the whole system pressure adjusting process, such as adjusting efficiency, and selecting the group of coefficients with the most excellent performance; after the opening time length proportion is determined, the updated opening time length can be obtained by multiplying the opening time length proportion and the set total time length.
And S52, updating the closing time length according to the updated opening time length.
After the opening duration is updated, since the sum of the opening duration and the closing duration is a fixed value, that is, the set total duration, a difference between the set total duration and the opening duration may be determined, and the difference is the updated closing duration.
In this embodiment, when the temperature of the coil pipe is greater than the set temperature, the opening duration is updated according to the historical temperature difference and the last opening duration of the outdoor fan, and the closing duration is updated according to the updated opening duration.
Referring to fig. 4, a third embodiment of the present invention provides a method for controlling a constant-frequency air conditioner, based on the first embodiment shown in fig. 2, after step S40, the method further includes:
step S70, when the temperature of the coil pipe is less than or equal to the set temperature, the outdoor fan is started and controlled to maintain the starting state;
when the fixed-frequency air conditioner detects that the temperature of the coil is less than or equal to the set temperature, the pressure of the system is in a normal state, and the outdoor fan is turned on and kept in an on state, so that a more stable heat circulation process is carried out.
In addition, in the heating process, the fixed-frequency air conditioner also needs to ensure that the indoor temperature is kept above a certain temperature, so that the fixed-frequency air conditioner also obtains the indoor temperature when detecting that the temperature of the coil is less than or equal to the set temperature, and when the indoor temperature is greater than or equal to the set indoor temperature, the outdoor fan is started and controlled to maintain the starting state.
S80, detecting the temperature of a coil pipe of the fixed-frequency air conditioner at regular time;
in the process of keeping the outdoor fan on, the system pressure of the fixed-frequency air conditioner will further rise along with the continuous operation of the outdoor fan and the compressor, so that after the outdoor fan is kept on, the temperature of a coil pipe of the fixed-frequency air conditioner needs to be detected at regular time, and under the condition that the system pressure is too high, the outdoor fan is further controlled based on the mode of controlling the outdoor fan to be on and off according to the first embodiment so as to continuously control the system pressure; in addition, the timing means detects the temperature of the coil at fixed time intervals, and the fixed time intervals can be set according to needs, for example, if the system pressure needs to be detected in time, the accuracy of controlling the system pressure is improved, the fixed time intervals can be reduced as much as possible, or the fixed time intervals can be prolonged in order to avoid the problem of power consumption or performance consumption caused by detecting the temperature of the coil too frequently; it should be noted that the coil temperature is used to indicate the system pressure as one of the output temperatures of the fixed-frequency air conditioner, and the coil temperature is not used to indicate the indoor temperature.
And S90, when the temperature of the coil pipe is detected to be higher than the set temperature, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
The fixed-frequency air conditioner needs to further enter the process of controlling the outdoor fan to be turned on and off to reduce the system pressure when detecting that the temperature of the coil is greater than the set temperature, that is, step S20 and the subsequent steps of the first embodiment are executed until detecting that the temperature of the coil is less than or equal to the set temperature, and the outdoor fan is turned on and the on state of the outdoor fan is maintained.
In this embodiment, when the temperature of the coil pipe is less than or equal to the set temperature, the outdoor fan is turned on and controlled to maintain the on-state, the temperature of the coil pipe of the fixed-frequency air conditioner is detected at regular time, and when the temperature of the coil pipe is detected to be greater than the set temperature, the step of obtaining the on-time and the off-time of the outdoor fan of the fixed-frequency air conditioner is executed, so that the fixed-frequency air conditioner can enter a normal thermal cycle process under the condition that the system pressure is normal, and under the condition that the system pressure is too high, the system pressure of the fixed-frequency air conditioner is reduced, the output heat is maintained, and the comfort level of a user is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a fixed-frequency air conditioner to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (5)
1. A control method of a fixed-frequency air conditioner is characterized by comprising the following steps:
starting a fixed-frequency air conditioner;
when the fixed-frequency air conditioner is detected to be in a heating mode and the temperature of a coil of the fixed-frequency air conditioner is higher than a set temperature, the opening duration and the closing duration of an outdoor fan of the fixed-frequency air conditioner are obtained;
when the duration of starting the outdoor fan reaches the starting duration, the outdoor fan is closed;
when the continuous time for closing the outdoor fan reaches the closing time, detecting the temperature of a coil pipe of the fixed-frequency air conditioner;
when the temperature of the coil pipe is higher than the set temperature, updating the starting time according to the historical temperature difference and the last starting duration of the outdoor fan;
updating the closing time length according to the updated opening time length, wherein the set temperature is the temperature of a coil pipe when the system pressure of the fixed-frequency air conditioner is normal, and the historical temperature difference is the difference value between the coil pipe temperature detected in the past after the fixed-frequency air conditioner is opened and the set temperature;
starting the outdoor fan, and returning to the step of acquiring the starting time and the closing time of the outdoor fan of the fixed-frequency air conditioner;
when the temperature of the coil pipe is less than or equal to the set temperature, acquiring indoor temperature;
when the indoor temperature is greater than or equal to the set indoor temperature, starting the outdoor fan and controlling the outdoor fan to maintain the starting state;
detecting the temperature of a coil pipe of the fixed-frequency air conditioner at fixed time;
and when the temperature of the coil pipe is detected to be higher than the set temperature, executing the step of acquiring the opening time and the closing time of the outdoor fan of the fixed-frequency air conditioner.
2. The method as claimed in claim 1, wherein the step of updating the turn-on duration according to the historical temperature difference and the last turn-on duration of the outdoor fan comprises:
determining an opening time length proportion according to the historical temperature difference and the last opening time length of the outdoor fan, wherein the opening time length proportion is the ratio of the opening time length to the set total switching time length of the outdoor fan, and the set total switching time length is the total time length of the outdoor fan which is continuously closed once after being continuously opened once;
and updating the opening duration according to the opening duration proportion.
3. The method of claim 2, wherein the historical temperature difference includes three temperature differences that are the latest in time to detect the temperature of the coil, and the step of determining the on-time ratio according to the historical temperature difference and the last on-time duration of the outdoor fan comprises:
determining a target ratio of the last starting duration of the outdoor fan to the set total switching duration;
determining the opening time length proportion according to the historical temperature differences, the target ratio and a preset mapping relation, wherein the preset mapping relation is the mapping relation of the historical temperature differences, the target ratio and the opening time length proportion, and parameters of the preset mapping relation comprise a preset proportionality coefficient, a preset integral coefficient and a preset differential coefficient.
4. A constant frequency air conditioner, characterized in that the constant frequency air conditioner comprises a memory, a processor and a control program of the constant frequency air conditioner stored on the memory and operable on the processor, wherein the control program of the constant frequency air conditioner realizes the steps of the control method of the constant frequency air conditioner according to any one of claims 1 to 3 when executed by the processor.
5. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of a fixed-frequency air conditioner, which when executed by a processor, implements the steps of the control method of the fixed-frequency air conditioner according to any one of claims 1 to 3.
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| CN114396715B (en) * | 2022-01-13 | 2023-08-08 | 北京小米移动软件有限公司 | Equipment control method, device, electronic equipment and storage medium |
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