CN112856742B - Control method and device of air conditioner, air conditioner and readable storage medium - Google Patents
Control method and device of air conditioner, air conditioner and readable storage medium Download PDFInfo
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- CN112856742B CN112856742B CN201911196238.5A CN201911196238A CN112856742B CN 112856742 B CN112856742 B CN 112856742B CN 201911196238 A CN201911196238 A CN 201911196238A CN 112856742 B CN112856742 B CN 112856742B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/01—Timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
Abstract
The invention provides a control method and a control device of an air conditioner, the air conditioner and a readable storage medium, wherein the method comprises the following steps: acquiring a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located; determining a current state of the indoor heat exchanger according to the first indoor temperature and the first evaporator temperature; the indoor heat exchanger is in an overheat state, and the expansion valve is controlled to be opened. The invention can effectively detect the overheating condition of the indoor heat exchanger in time and adopt corresponding treatment, thereby solving the problem that the expansion valve can not be controlled according to the overheating degree of the return air under the condition of small flow.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner, the air conditioner and a readable storage medium.
Background
With the increasing requirements on energy conservation and environmental protection, the admission level of energy efficiency is also increased year by year, and the demand of consumers is increased, so that the high-energy-efficiency household air conditioner is more and more favored. The high-energy-efficiency household air conditioner generally uses an expansion valve for throttling, the capacity and the energy efficiency of the household air conditioner under low load are improved by changing the flow, and the current mainstream expansion valve control method comprises control according to the superheat degree of return air.
However, there is a problem that when the expansion valve is controlled according to the degree of superheat of the return air, the temperature of the evaporation side is in an overheated state when the flow rate of the refrigerant in the air conditioner is small, and at this time, the expansion valve cannot be controlled according to the degree of superheat of the return air.
Disclosure of Invention
The invention mainly aims to provide a control method and device of an air conditioner, the air conditioner and a readable storage medium, and aims to solve the technical problem that an expansion valve cannot be controlled according to the superheat degree of return air in a small-flow state of the air conditioner.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling an air conditioner, including:
acquiring a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
determining a current state of the indoor heat exchanger according to the first indoor temperature and the first evaporator temperature;
the indoor heat exchanger is in an overheat state, and the expansion valve is controlled to be opened.
Optionally, the step of controlling the expansion valve to open comprises:
and controlling the opening degree of the expansion valve to open for a preset number of steps every other preset regulation period.
Optionally, the step of determining the current state of the indoor heat exchanger according to the indoor temperature and the evaporator temperature comprises:
determining a first difference between the first indoor temperature and the first evaporator temperature;
and determining that the indoor heat exchanger is in an overheat state when the first difference value is smaller than a first preset threshold value and lasts for a first preset time.
Optionally, after the step of controlling the expansion valve to open when the indoor heat exchanger is in the overheat state, the method further includes:
acquiring a second evaporator temperature of an indoor heat exchanger of the air conditioner and a second indoor temperature of an area where the indoor heat exchanger is located, and determining a second difference value between the second indoor temperature and the second evaporator temperature;
and determining that the indoor heat exchanger is recovered to be normal when the second difference value is greater than a second preset threshold value and lasts for a second preset time period, wherein the second preset threshold value is greater than the first preset threshold value.
Optionally, after the step of controlling the expansion valve to open when the indoor heat exchanger is in the overheat state, the method further includes:
acquiring a third evaporator temperature of an indoor heat exchanger of the air conditioner and a third indoor temperature of an area where the indoor heat exchanger is located, and determining a third difference value between the third indoor temperature and the third evaporator temperature and an opening degree of the expansion valve;
and determining that the air conditioner is in an abnormal state when the opening degree of the expansion valve is greater than a preset opening degree and the third difference value is less than or equal to the first preset threshold value.
Optionally, after the step of determining that the air conditioner is in an abnormal state, the method further includes:
and controlling the air conditioner to stop and giving an alarm.
Optionally, the step of controlling the air conditioner to stop and giving an alarm includes:
and controlling the air conditioner to stop and sending corresponding warning information to a preset terminal.
In addition, to achieve the above object, an embodiment of the present invention further provides a control device for an air conditioner, including:
the temperature acquisition module is used for acquiring a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
a state determination module, configured to determine a current state of the indoor heat exchanger according to the first indoor temperature and the first evaporator temperature;
and the expansion valve control module is used for controlling the expansion valve to be opened when the indoor heat exchanger is in an overheat state.
In addition, to achieve the above object, an embodiment of the present invention further provides an air conditioner, which includes a processor, a memory, and a computer program stored on the memory and executable by the processor, wherein when the computer program is executed by the processor, the steps of the control method of the air conditioner as described above are implemented.
In addition, to achieve the above object, an embodiment of the present invention further provides a readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of the control method of the air conditioner as described above.
The method comprises the steps of acquiring the evaporation temperature and the indoor temperature of an indoor heat exchanger, and judging the state of the indoor heat exchanger according to the evaporation temperature and the indoor temperature of the indoor heat exchanger; if the indoor heat exchanger is in an overheat state, the expansion valve is controlled to be opened, so that the overheat of the indoor heat exchanger can be timely and effectively detected, corresponding treatment is adopted, the problem that the expansion valve cannot be controlled according to the superheat degree of return air in a low-flow state is solved, and the stability of the operation of the air conditioner is improved.
Drawings
Fig. 1 is a schematic diagram of an air conditioner hardware architecture according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a control method of an air conditioner according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioner according to a first embodiment of a control method of the air conditioner of the present invention;
fig. 4 is a functional block diagram of a control device of an air conditioner according to a first embodiment of the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration and are not intended to limit the invention.
The control method of the air conditioner is mainly applied to the air conditioner.
Referring to fig. 1, fig. 1 is a schematic diagram of an air conditioner hardware architecture according to an embodiment of the present invention. In the embodiment of the present invention, the air conditioner includes a general air conditioner, and may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the components; the user interface 1003 may include a Display (Display), an input unit such as a key (Keyboard); the network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration shown in fig. 1 is not intended to limit the present invention, and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
With continued reference to FIG. 1, the memory 1005 of FIG. 1, which is one type of readable storage medium, may include an operating system, a network communication module, and a computer program. In fig. 1, the network communication module may be used to connect the user terminal and perform data communication with the user terminal; and the processor 1001 may call the computer program stored in the memory 1005 and perform the following steps:
acquiring a first evaporator temperature of an indoor heat exchanger of an air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
determining a current state of the indoor heat exchanger according to the first indoor temperature and the first evaporator temperature;
and the indoor heat exchanger is in an overheat state, and the expansion valve is controlled to be opened.
Further, the step of controlling the expansion valve to open comprises:
and controlling the opening degree of the expansion valve to open for a preset step number every preset adjusting period.
Further, the step of determining the current state of the indoor heat exchanger according to the indoor temperature and the evaporator temperature includes:
determining a first difference between the first indoor temperature and the first evaporator temperature;
and determining that the indoor heat exchanger is in an overheat state when the first difference value is smaller than a first preset threshold value and lasts for a first preset time.
Further, after the step of controlling the expansion valve to open when the indoor heat exchanger is in the superheated state, the method further includes:
acquiring a second evaporator temperature of an indoor heat exchanger of the air conditioner and a second indoor temperature of an area where the indoor heat exchanger is located, and determining a second difference value between the second indoor temperature and the second evaporator temperature;
and determining that the indoor heat exchanger is recovered to be normal when the second difference is greater than a second preset threshold value and lasts for a second preset time, wherein the second preset threshold value is greater than the first preset threshold value.
Further, after the step of controlling the expansion valve to open when the indoor heat exchanger is in the superheated state, the method further includes:
acquiring a third evaporator temperature of an indoor heat exchanger of the air conditioner and a third indoor temperature of an area where the indoor heat exchanger is located, and determining a third difference value between the third indoor temperature and the third evaporator temperature and an opening degree of the expansion valve;
and determining that the air conditioner is in an abnormal state when the opening degree of the expansion valve is greater than a preset opening degree and the third difference value is less than or equal to the first preset threshold value.
Further, after the step of determining that the air conditioner is in an abnormal state, the method further includes:
and controlling the air conditioner to stop and giving an alarm.
Further, the step of controlling the air conditioner to stop and giving an alarm includes:
and controlling the air conditioner to stop and sending corresponding warning information to a preset terminal.
The embodiment of the invention provides a control method of an air conditioner.
Referring to fig. 2, fig. 2 is a flowchart illustrating a control method of an air conditioner according to a first embodiment of the present invention.
In this embodiment, the control method of the air conditioner includes the following steps:
step S10, acquiring a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
the expansion valve control method of the current mainstream air conditioner comprises control according to the return air superheat degree, however, when the return air superheat degree is adopted to control the expansion valve, certain problems exist, when the flow of the refrigerant in the air conditioner is small, the temperature of an evaporation side is in an overheat state, and at the moment, the expansion valve cannot be controlled according to the return air superheat degree. In view of the above, the present embodiment provides a control method of an air conditioner, which obtains an evaporation temperature and an indoor temperature of an indoor heat exchanger, and determines a state of the indoor heat exchanger according to the evaporation temperature and the indoor temperature of the indoor heat exchanger; if the indoor heat exchanger is in an overheat state, the expansion valve is controlled to be opened, so that the overheat of the indoor heat exchanger can be timely and effectively detected, corresponding treatment is adopted, the problem that the expansion valve cannot be controlled according to the degree of superheat of return air in a low-flow state is solved, and the stability of the operation of the air conditioner is improved.
The control method of the air conditioner of the embodiment is mainly applied to the air conditioner, that is, the air conditioner controls the operation condition of the air conditioner, and may also be applied to a certain control device (or terminal, device), and the control device controls the air conditioner, and of course, the control device may be a single device, or an abstract function device composed of a plurality of different entity devices. For convenience of explanation, the present embodiment will be described by taking an example in which the air conditioner controls itself. As for the air conditioner, the air conditioner includes the components of a general air conditioner, for example, see fig. 3, fig. 3 is a schematic structural diagram of the air conditioner of this embodiment; the air conditioner comprises a compressor, an outdoor heat exchanger, an axial flow wind wheel, an expansion valve (which can be an electronic expansion valve), an indoor heat exchanger, a cross flow wind wheel, a four-way valve and other components; in addition, the air conditioner also comprises a first temperature sensor and a second temperature sensor; a first temperature sensor is provided at the indoor heat exchanger for detecting an evaporator temperature (evaporator coil temperature) of the indoor heat exchanger; the second temperature sensor is used for detecting the indoor temperature of the area where the indoor heat exchanger is located, and the second temperature sensor may be arranged at the indoor heat exchanger, or may be arranged at another position.
In this embodiment, when the air conditioner is started to operate, the first temperature sensor may obtain the first evaporator temperature TC1 of the indoor heat exchanger, and the second temperature sensor may obtain the first indoor temperature TA1 of the area where the indoor heat exchanger is located in real time.
It should be noted that, in practice, when the air conditioner is just started to operate, because the operating condition and the environmental (temperature) condition do not reach a relatively stable state, the air conditioner may obtain the first evaporator temperature TC1 and the first indoor temperature TA1 after the air conditioner is started to operate for a certain time, so as to avoid an analysis error caused by instability of the operating condition and the environmental condition on subsequent analysis. In addition, the second temperature sensor of the air conditioner is used to obtain the indoor temperature in this embodiment, but in practice, the second temperature sensor may not be provided in the air conditioner, and the indoor temperature is obtained by other independent devices, and then the indoor temperature TA is sent to the air conditioner.
Step S20, determining a current state of the indoor heat exchanger according to the indoor temperature and the evaporator temperature;
in this embodiment, when the air conditioner obtains the first indoor temperature TA1 and the first evaporator temperature TC1, the state of the indoor heat exchanger may be analyzed and determined according to the first indoor temperature TA1 and the first evaporator temperature TC1 to determine whether it is currently in an overheat state. In the present embodiment, the state of the indoor heat exchanger is analyzed and determined based on the first indoor temperature TA1 and the first evaporator temperature TC1, so that the state of the indoor heat exchanger can be determined accurately in time without being affected by an excessively small refrigerant flow rate of the air conditioner.
Specifically, the step S20 includes:
determining a difference between the first indoor temperature and the first evaporator temperature;
in the present embodiment, when the air conditioner obtains the first indoor temperature TA1 and the first evaporator temperature TC1, the air conditioner may calculate a first difference Δ T1 between the first indoor temperature TA1 and the first evaporator temperature TC1, that is, a first difference Δ T1 is TA1-TC 1; a further state analysis can then be performed on the basis of this first difference Δ T1. It is worth mentioning that the indoor temperature and the evaporator temperature are obtained in real time, so that the difference can also be calculated in real time, but it can also be calculated at intervals, for example, every 2 seconds.
And determining that the indoor heat exchanger is in an overheat state when the difference is less than or equal to a first preset threshold value and lasts for a first preset time.
In this embodiment, when the first difference Δ T1 between the first indoor temperature TA1 and the first evaporator temperature TC1 is obtained, the first difference Δ T1 may be compared with a first preset threshold M, and if the first difference Δ T1 is less than or equal to the first preset threshold M and the situation that the first difference Δ T1 is less than or equal to the first preset threshold M continues for a first preset time period, it is determined that the indoor heat exchanger is currently in an overheat state. For example, if the first preset threshold value is 2, the first preset time period is 2 minutes, the current first difference Δ T1 is less than 2, and the duration "less than" exceeds 2 minutes, it is determined that the indoor heat exchanger is in the overheat state. If the first difference Δ T1 is greater than a first preset threshold, it is determined that the indoor heat exchanger is in a normal state; in addition, if the first difference Δ T1 is less than or equal to the first preset threshold M but the duration does not exceed the first preset duration, it can be considered that the indoor heat exchanger is in a normal state.
In practice, it is also possible to adopt other manners, such as counting the total duration of the first difference Δ T1 exceeding the first preset duration within a certain period (different from the duration described above, the total duration may be the sum of durations of a plurality of intermittent periods), and then determining whether the total duration is greater than the preset duration, if so, the indoor heat exchanger is considered to be in the overheat state, and if so, the indoor heat exchanger is considered to be in the normal state.
In step S30, the indoor heat exchanger is in an overheated state, and the expansion valve is controlled to open.
In this embodiment, when it is determined that the indoor heat exchanger is in an overheat state, the air conditioner needs to be adjusted in time to restore the indoor heat exchanger to a normal state. In this embodiment, the air conditioner may adjust the expansion valve, and control the expansion valve to open to adjust the expansion valve to a larger opening degree, so as to increase the refrigerant flow and further enable the indoor heat exchanger to return to normal.
Further, the step of controlling the expansion valve to open comprises:
and controlling the opening degree of the expansion valve to open for a preset step number every preset adjusting period.
In this embodiment, when the expansion valve is controlled to open, a periodic continuous opening mode may be adopted, so as to avoid that the adjustment amplitude is too large and seriously deviates from the current set working condition or generates other abnormalities. Specifically, a preset adjustment time and a preset number of steps may be preset, and then the opening degree of the expansion valve is controlled to be opened every preset adjustment time by the preset number of steps, for example, if the preset adjustment period is 3s and the preset number of steps is 2 steps, the opening degree of the expansion valve is opened every 3 seconds by 2 steps during the control. Of course, in practice, the expansion valve may be controlled to be opened in other manners, for example, the number of steps for opening each time may be determined according to the magnitude of the difference Δ T, and the larger the current difference is, the larger the number of steps for opening the expansion valve this time is, or in other manners.
In the embodiment, the evaporator temperature of an indoor heat exchanger of the air conditioner and the indoor temperature of an area where the indoor heat exchanger is located are obtained; determining the current state of the indoor heat exchanger according to the indoor temperature and the evaporator temperature; the indoor heat exchanger is in an overheat state, and the expansion valve is controlled to be opened. Through the above manner, the evaporation temperature and the indoor temperature of the indoor heat exchanger are obtained, and the state of the indoor heat exchanger is judged according to the evaporation temperature and the indoor temperature of the indoor heat exchanger; if the indoor heat exchanger is in an overheat state, the expansion valve is controlled to be opened, so that the overheat of the indoor heat exchanger can be timely and effectively detected, corresponding treatment is adopted, the problem that the expansion valve cannot be controlled according to the superheat degree of return air in a low-flow state is solved, and the stability of the operation of the air conditioner is improved.
Based on the embodiment shown in fig. 2, a second embodiment of the air conditioner control method according to the present invention is provided.
In this embodiment, after the step S30, the method further includes:
acquiring a second evaporator temperature of an indoor heat exchanger of the air conditioner and a second indoor temperature of an area where the indoor heat exchanger is located, and determining a second difference value between the second indoor temperature and the second evaporator temperature;
in this embodiment, after determining that the indoor heat exchanger is in an overheated state and controlling the expansion valve to open, the air conditioner may still obtain the current indoor temperature and the current evaporator temperature, which may be referred to as a second indoor temperature TA2 and a second evaporator temperature TC2 for convenience of description, and further determine a second difference Δ T therebetween, so as to analyze and determine whether the indoor heat exchanger is normal according to the second difference Δ T2.
And determining that the indoor heat exchanger is recovered to be normal when the second difference value is greater than a second preset threshold value and lasts for a second preset time period, wherein the second preset threshold value is greater than the first preset threshold value.
After the expansion valve is controlled to be opened, if a second difference Δ T2 between the second indoor temperature TA2 and the second evaporator temperature TC2 is detected to be greater than a second preset threshold N, and the situation that the difference Δ T is greater than the second preset threshold N continues for a second preset time period, it is determined that the indoor heat exchanger is currently recovered to be normal, wherein the second preset threshold N is greater than the first preset threshold M in the first embodiment (if N is M + 1); for example, when the first preset threshold value is 2, the second preset threshold value is 3, and the second preset time period is 2 minutes, after the expansion valve is opened, it is detected that the difference Δ T between the second indoor temperature TA2 and the second evaporator temperature TC2 is greater than 3, and the duration of "greater than" exceeds 2 minutes, it is determined that the indoor heat exchanger is currently recovered to be normal. And, upon determining that the indoor heat exchanger is currently restored, the air conditioner may continue to operate while maintaining the current operation state (parameter). For example, when the expansion valve is controlled by "controlling the opening degree of the expansion valve to open at every preset adjustment period by a preset number of steps" as exemplified in the first embodiment, if it is detected that the second difference Δ T2 is greater than the second preset threshold N and the situation that the second difference Δ T2 is greater than the second preset threshold N continues for a second preset time period, it is determined that the indoor heat exchanger is currently returned to normal, and at this time, the periodic continuous opening of the expansion valve is stopped, and the operation of the expansion valve at the current opening degree is maintained. Through the manner, after the expansion valve is controlled, the state of the indoor heat exchanger is analyzed through the difference value between the indoor temperature and the evaporator temperature to determine whether the indoor heat exchanger is recovered to be normal or not, and the indoor heat exchanger can still keep running in the current state when the indoor heat exchanger is recovered to be normal, so that the phenomenon that the adjustment amplitude is too large and the indoor heat exchanger is seriously deviated from the current set working condition or generates other abnormalities is avoided.
A third embodiment of the air conditioner control method according to the present invention is proposed based on the above-described embodiment shown in fig. 2.
In this embodiment, after step S30, the method further includes:
acquiring a third evaporator temperature of an indoor heat exchanger of the air conditioner and a third indoor temperature of an area where the indoor heat exchanger is located, and determining a third difference value between the third indoor temperature and the third evaporator temperature and an opening degree of the expansion valve;
in this embodiment, after determining that the indoor heat exchanger is in an overheated state and controlling the expansion valve to open, the air conditioner may still obtain the current indoor temperature and the current evaporator temperature, which may be referred to as a third indoor temperature TA3 and a third evaporator temperature TC3 for convenience of description, and further determine a third difference Δ T3 therebetween, so as to analyze and determine whether the indoor heat exchanger recovers to normal according to the third difference Δ T3; in addition, in the present embodiment, the state of the indoor heat exchanger is also analyzed in conjunction with the opening degree of the expansion valve, and thus the opening degree of the expansion valve is also determined.
And determining that the air conditioner is in an abnormal state when the opening degree of the expansion valve is greater than a preset opening degree and the third difference value is less than or equal to the first preset threshold value.
In this embodiment, when it is determined that the indoor heat exchanger is in an overheat state, the expansion valve is controlled to be opened, and a specific control manner may be "control the opening degree of the expansion valve to be opened by a preset number of steps every preset adjustment period" as exemplified in the first embodiment; after the expansion valve is opened, the air conditioner acquires the current opening degree of the expansion valve, the third indoor temperature TA3 and the third evaporator temperature TC3, and determines a third difference value Δ T3 between the third indoor temperature TA3 and the third evaporator temperature TC 3; if the opening degree of the expansion valve is greater than a predetermined opening degree (e.g., 500 steps) and the third difference Δ T3 is less than or equal to the first predetermined threshold M, it may be determined that the current opening degree of the expansion valve and the opening degree adjusted to a relatively large value still cannot solve the problem of the overheat state of the indoor heat exchanger, and at this time, it may be that a problem occurs in other parts of the air conditioner, such as insufficient refrigerant of the air conditioner, an abnormal flow control function of the expansion valve, and the like, and at this time, it is determined that the air conditioner is in an abnormal state. Through the manner, after the expansion valve is controlled, the state of the air conditioner is analyzed through the difference value delta T and the opening degree of the expansion valve, and the condition that the indoor heat exchanger cannot be recovered even if the air conditioner is adjusted severely is avoided.
Furthermore, after the air conditioner is determined to be in an abnormal state, in order to avoid more serious problems caused by abnormal operation of the air conditioner, the air conditioner can be controlled to stop, and meanwhile, an alarm can be given; wherein, the alarm mode can be set according to the actual situation. For example, the relevant character prompt can be displayed on a display screen of the air conditioner; the air conditioner can also send out warning prompt tone for the air conditioner; the air conditioner may also be in network connection with a certain preset terminal (for example, in network connection with a mobile phone of a user), and then send corresponding warning information to the preset terminal, where the content of the warning information may include determining abnormal time of the air conditioner, an identifier of the abnormal air conditioner, previous abnormal time, and the like, so that the user can know the abnormal condition of the air conditioner in time. Through the mode, after the air conditioner is detected to be in the abnormal state, the air conditioner can be stopped, the problem that the air conditioner operates abnormally to cause more serious is avoided, and meanwhile, the alarm can be given to prompt a user to overhaul the air conditioner in time.
Still further, the air conditioner may also periodically count the abnormal conditions and generate a corresponding abnormal log, for example, count the abnormal conditions in the current month on the last day of each month, and generate a corresponding abnormal log, where the log content includes the total number of abnormal times in the current month (the period), the time of each abnormal event, the time length from the start-up of each abnormal event, and the like. When the abnormal log is obtained, the abnormal log can be sent to a corresponding user terminal so that a user can know the abnormal condition in the period. Through the mode, the abnormal conditions of the air conditioner in the period can be counted and recorded, so that a user can analyze the operation condition of the air conditioner according to the record, correspondingly maintain and process the air conditioner, and the stability of the operation of the air conditioner is guaranteed.
In addition, the embodiment of the invention also provides a control device of the air conditioner.
Referring to fig. 4, fig. 4 is a functional block diagram of a control device of an air conditioner according to a first embodiment of the present invention.
In this embodiment, the control device of the air conditioner includes:
a temperature obtaining module 10, configured to obtain a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
a state determining module 20, configured to determine a current state of the indoor heat exchanger according to the first indoor temperature and the first evaporator temperature;
and an expansion valve control module 30 for controlling the expansion valve to be opened when the indoor heat exchanger is in an overheat state.
Each virtual function module of the control device of the air conditioner is stored in the memory 1005 shown in fig. 1, and is used for realizing all functions of controlling the air conditioner; when executed by the processor 1001, the modules may perform air conditioner control functions.
Further, the expansion valve control module 30 includes:
and the period control unit is used for controlling the opening of the expansion valve to open a preset step number every preset adjusting period.
Further, the status determining module 20 includes:
a temperature difference determination unit for determining a first difference value between the first indoor temperature and the first evaporator temperature;
and the state determining unit is used for determining that the indoor heat exchanger is in an overheating state when the first difference value is smaller than a first preset threshold value and lasts for a first preset time.
Further, the temperature obtaining module 10 is further configured to obtain a second evaporator temperature of an indoor heat exchanger of the air conditioner and a second indoor temperature of an area where the indoor heat exchanger is located, and determine a second difference between the second indoor temperature and the second evaporator temperature;
the state determining module 20 is further configured to determine that the indoor heat exchanger is recovered to be normal when the second difference is greater than a second preset threshold and lasts for a second preset duration, where the second preset threshold is greater than the first preset threshold.
Further, the temperature obtaining module 10 is further configured to obtain a third evaporator temperature of an indoor heat exchanger of the air conditioner and a third indoor temperature of an area where the indoor heat exchanger is located, and determine a third difference between the third indoor temperature and the third evaporator temperature and an opening degree of the expansion valve;
the state determining module 20 is further configured to determine that the air conditioner is in an abnormal state when the opening degree of the expansion valve is greater than a preset opening degree and the third difference value is less than or equal to the first preset threshold value.
Further, the control device of the air conditioner further includes:
and the shutdown alarm module is used for controlling the air conditioner to shut down and give an alarm.
Further, the shutdown alarm module is specifically configured to control the air conditioner to shutdown, and send corresponding alarm information to a preset terminal.
The function implementation of each module of the control device of the air conditioner corresponds to each step in the control method embodiment of the air conditioner, and the function and implementation process are not described in detail herein.
In addition, the embodiment of the invention also provides a readable storage medium.
The readable storage medium of the present invention stores thereon a computer program, wherein the computer program, when executed by a processor, implements the steps of the control method of an air conditioner as described above.
The method implemented when the computer program is executed may refer to each embodiment of the control method of the air conditioner of the present invention, and is not described herein again.
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 phrase "comprising an … …" does not exclude the presence of other 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 above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or the portions contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device) 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 not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A control method of an air conditioner, characterized by comprising:
acquiring a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
determining a first difference between the first indoor temperature and the first evaporator temperature;
the first difference value is smaller than a first preset threshold value and lasts for a first preset time, and the indoor heat exchanger is determined to be in an overheat state;
the indoor heat exchanger is in an overheat state, and the opening degree of the expansion valve is controlled to be opened for preset steps every preset adjusting period.
2. The control method of an air conditioner according to claim 1, wherein the indoor heat exchanger is in an overheated state, and after the step of controlling the opening degree of the expansion valve to be opened by a preset number of steps every preset regulation period, further comprising:
acquiring a second evaporator temperature of an indoor heat exchanger of the air conditioner and a second indoor temperature of an area where the indoor heat exchanger is located, and determining a second difference value between the second indoor temperature and the second evaporator temperature;
and determining that the indoor heat exchanger is recovered to be normal when the second difference is greater than a second preset threshold value and lasts for a second preset time, wherein the second preset threshold value is greater than the first preset threshold value.
3. The control method of an air conditioner according to claim 1, wherein the indoor heat exchanger is in an overheated state, and after the step of controlling the opening degree of the expansion valve to be opened by a preset number of steps every preset regulation period, further comprising:
acquiring a third evaporator temperature of an indoor heat exchanger of the air conditioner and a third indoor temperature of an area where the indoor heat exchanger is located, and determining a third difference value between the third indoor temperature and the third evaporator temperature and an opening degree of the expansion valve;
and determining that the air conditioner is in an abnormal state when the opening degree of the expansion valve is greater than a preset opening degree and the third difference value is less than or equal to the first preset threshold value.
4. The control method of an air conditioner according to claim 3, wherein the step of determining that the air conditioner is in an abnormal state, after the step of determining that the opening degree of the expansion valve is greater than a preset opening degree and the third difference value is less than or equal to the first preset threshold value, further comprises:
and controlling the air conditioner to stop and giving an alarm.
5. The control method of an air conditioner according to claim 4, wherein the step of controlling the air conditioner to stop and perform the warning includes:
and controlling the air conditioner to stop and sending corresponding warning information to a preset terminal.
6. A control apparatus of an air conditioner, comprising:
the temperature acquisition module is used for acquiring a first evaporator temperature of an indoor heat exchanger of the air conditioner and a first indoor temperature of an area where the indoor heat exchanger is located;
a state determining module, configured to determine a first difference between the first indoor temperature and the first evaporator temperature, where the first difference is smaller than a first preset threshold and lasts for a first preset duration, and determine a current state of the indoor heat exchanger;
and the expansion valve control module is used for controlling the opening of the expansion valve to be opened for a preset step number every a preset regulation period when the indoor heat exchanger is in an overheat state.
7. An air conditioner comprising a processor, a memory, and a computer program stored on the memory and executed by the processor, wherein the computer program, when executed by the processor, implements the steps of the control method of the air conditioner according to any one of claims 1 to 5.
8. A readable storage medium, characterized in that a computer program is stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method of an air conditioner according to any one of claims 1 to 5.
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| CN114812088B (en) * | 2021-01-28 | 2023-02-24 | 合肥美的电冰箱有限公司 | Refrigeration equipment, control method and device thereof, electronic equipment and storage medium |
| WO2022161439A1 (en) * | 2021-01-28 | 2022-08-04 | 合肥美的电冰箱有限公司 | Refrigeration equipment and control method and apparatus therefor, electronic device, and storage medium |
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| JP4854779B2 (en) * | 2009-12-09 | 2012-01-18 | シャープ株式会社 | Air conditioner, expansion valve opening control method and program |
| CN102368009B (en) * | 2011-11-09 | 2014-01-22 | 宁波奥克斯电气有限公司 | Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner |
| CN103512153B (en) * | 2013-07-16 | 2016-08-31 | 广东美芝制冷设备有限公司 | Air-conditioning system with enthalpy increased through vapor injection and control method thereof |
| CN103982988B (en) * | 2014-05-08 | 2017-06-09 | 广东美的制冷设备有限公司 | Prevent a method and device for dragging many air-conditionings excessively to heat |
| CN106352611B (en) * | 2016-08-26 | 2018-11-20 | 芜湖美智空调设备有限公司 | Multi-split air conditioner and its control method for electronic expansion valve |
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