CN112856744B - 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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- CN112856744B CN112856744B CN201911210142.XA CN201911210142A CN112856744B CN 112856744 B CN112856744 B CN 112856744B CN 201911210142 A CN201911210142 A CN 201911210142A CN 112856744 B CN112856744 B CN 112856744B
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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
- 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
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: the air conditioner is operated in a heating mode, the temperature of a first evaporator of an indoor heat exchanger of the air conditioner and the temperature of a first room of an area where the indoor heat exchanger is located are obtained, and the first operating frequency of a compressor of the air conditioner is obtained; determining a current state of the indoor heat exchanger based on the first evaporator temperature, the first indoor temperature, and the first operating frequency. The invention can judge the state of the indoor heat exchanger according to the temperature of the evaporator, the indoor temperature and the running frequency of the compressor, and solves the technical problem that the state of the indoor heat exchanger can not be determined in the existing return air superheat degree control method under the condition that the air conditioner is in heating running and the refrigerant is in a small flow state.
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 usually 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.
When the air conditioner is in a heating mode, if the return air superheat degree is adopted for control, temperature detection is carried out through a temperature sensor arranged at the outlet end of the outdoor heat exchanger, and the state of the air conditioner is determined according to a detection result; however, when the flow rate of the refrigerant of the air conditioner is small or the expansion valve is fully closed, the detection result may not reflect the state of the indoor heat exchanger, thereby affecting the control of the air conditioner.
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 the state of an indoor heat exchanger cannot be determined in the existing return air superheat degree control method under the condition that the air conditioner is in heating operation and the refrigerant is in a low-flow state.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling an air conditioner, including:
the air conditioner is operated in a heating mode, the temperature of a first evaporator of an indoor heat exchanger of the air conditioner and the temperature of a first room of an area where the indoor heat exchanger is located are obtained, and the first operating frequency of a compressor of the air conditioner is obtained;
determining a current state of the indoor heat exchanger based on the first evaporator temperature, the first indoor temperature, and the first operating frequency.
Optionally, the step of determining the current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the first operating frequency comprises:
determining a first difference value between the first evaporator temperature and the first indoor temperature, and determining a corresponding first preset threshold according to the first operating frequency;
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, the current state of the indoor heat exchanger includes an overheat state,
after the step of determining the current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the first operating frequency, the method further comprises the following steps:
the indoor heat exchanger is in an overheating state and performs overheating treatment on the air conditioner.
Optionally, the step of performing overheating treatment on the air conditioner includes:
and controlling the opening of an expansion valve of the air conditioner to open for a preset number of steps at intervals of a preset adjusting period.
Optionally, the indoor heat exchanger is in an overheat state, and after the step of performing overheat processing on the air conditioner, 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 acquiring a second operating frequency of a compressor of the air conditioner;
determining a second difference value between the second evaporator temperature and the second indoor temperature, and determining a corresponding second preset threshold according to the second operating frequency;
and if the second difference value is greater than a second preset threshold value and lasts for a second preset time, determining that the indoor heat exchanger is recovered to be normal.
Optionally, the indoor heat exchanger is in an overheat state, and after the step of performing overheat processing on the air conditioner, 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 acquiring a third operating frequency of a compressor of the air conditioner and an opening degree of an expansion valve;
determining a third difference value between the temperature of the third evaporator and the temperature in the third room and the opening degree of the expansion valve, and determining a corresponding third preset threshold according to the third operating frequency;
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 a third 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.
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 when the air conditioner is in heating operation, and acquiring a first operating frequency of a compressor of the air conditioner;
and the state determining module is used for determining the current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the first operating frequency.
In addition, in order 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, which stores a computer program, wherein when the computer program is executed by a processor, the steps of the control method of an air conditioner as described above are implemented.
According to the embodiment of the invention, the evaporator temperature, the indoor temperature and the compressor running frequency of the indoor heat exchanger are obtained during the heating running of the air conditioner, and the state of the indoor heat exchanger is judged according to the evaporator temperature, the indoor temperature and the compressor running frequency, so that the negative influence of small flow of the refrigerant on temperature detection during the heating running of the air conditioner can be avoided as much as possible, the state of the indoor heat exchanger can be effectively and accurately determined, and the air conditioner can be accurately controlled.
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 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 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 screen (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, WIreless FIdelity, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a 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 depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, 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 to a user terminal for data communication with the user terminal; and the processor 1001 may call up a computer program stored in the memory 1005 and perform the following steps:
the air conditioner is operated in a heating mode, the temperature of a first evaporator of an indoor heat exchanger of the air conditioner and the temperature of a first room of an area where the indoor heat exchanger is located are obtained, and the first operating frequency of a compressor of the air conditioner is obtained;
determining a current state of the indoor heat exchanger based on the first evaporator temperature, the first indoor temperature, and the first operating frequency.
Optionally, the step of determining the current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the first operating frequency comprises:
determining a first difference value between the first evaporator temperature and the first indoor temperature, and determining a corresponding first preset threshold according to the first operating frequency;
and the first difference 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.
Optionally, the determining the current status of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the first operating frequency further comprises:
the indoor heat exchanger is in an overheating state and performs overheating treatment on the air conditioner.
Optionally, the step of performing overheating treatment on the air conditioner includes:
and controlling the opening of an expansion valve of the air conditioner to open for a preset number of steps every preset adjusting period.
Optionally, the indoor heat exchanger is in an overheat state, and after the step of performing overheat processing on the air conditioner, 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 acquiring a second operating frequency of a compressor of the air conditioner;
determining a second difference value between the second evaporator temperature and the second indoor temperature, and determining a corresponding second preset threshold according to the second operating frequency;
and the second difference is greater than a second preset threshold value and lasts for a second preset time, and the indoor heat exchanger is determined to be recovered to be normal.
Optionally, the indoor heat exchanger is in an overheat state, and after the step of performing overheat processing on the air conditioner, 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 acquiring a third operating frequency of a compressor of the air conditioner and an opening degree of an expansion valve;
determining a third difference value between the third evaporator temperature and the third indoor temperature and the opening degree of the expansion valve, and determining a corresponding third preset threshold according to the third operating frequency;
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 a third 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.
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, the air conditioner performs heating operation, the first evaporator temperature of the indoor heat exchanger of the air conditioner and the first indoor temperature of the area where the indoor heat exchanger is located are obtained, and the first operation frequency of the compressor of the air conditioner is obtained;
the current mainstream expansion valve control method includes control based on the superheat of the return air. When the air conditioner is in a heating mode, if the return air superheat degree is adopted for control, temperature detection is carried out through a temperature sensor arranged at the outlet end of the outdoor heat exchanger, and the state of the air conditioner is determined according to a detection result; however, when the flow rate of the refrigerant of the air conditioner is small or the expansion valve is fully closed, the detection result may not reflect the state of the indoor heat exchanger, thereby affecting the control of the air conditioner. Therefore, in the control method of the air conditioner, the evaporator temperature, the indoor temperature and the compressor operating frequency of the indoor heat exchanger are obtained during the heating operation of the air conditioner, and the state of the indoor heat exchanger is judged according to the evaporator temperature, the indoor temperature and the compressor operating frequency, so that negative effects on temperature detection caused by small flow of the refrigerant during the heating operation of the air conditioner can be avoided as much as possible, the state of the indoor heat exchanger can be effectively and accurately determined, and the air conditioner can be accurately controlled.
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. For the air conditioner, including the components of a general air conditioner, as can be seen from 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 turned on and operates in a heating mode, the first temperature sensor may obtain a first evaporator temperature TC1 of the indoor heat exchanger, and the second temperature sensor may obtain a first indoor temperature TA1 of an area where the indoor heat exchanger is located in real time; meanwhile, the current first operating frequency H1 of the air conditioner can be obtained.
It should be noted that, in practice, when the air conditioner is just started, since the operating condition and the environmental (temperature) condition do not reach a relatively stable state, the air conditioner may operate in the heating mode for a certain time after the air conditioner is started, and then obtain the first evaporator temperature TC1, the first indoor temperature TA1 and the first operating frequency H1, thereby avoiding 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 the current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the first operating frequency.
In this embodiment, when the air conditioner obtains the first evaporator temperature TC1, the first indoor temperature TA1 and the first operating frequency H1, the state of the indoor heat exchanger may be analyzed and judged according to the first evaporator temperature TC1, the first indoor temperature TA1 and the first operating frequency H1 to determine whether the air conditioner is in an overheat state currently. In the present embodiment, the state of the indoor heat exchanger is analyzed and determined based on the first evaporator temperature TC1, the first indoor temperature TA1, and the first operating frequency H1, 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 first difference value between the first evaporator temperature and the first indoor temperature, and determining a corresponding first preset threshold value according to the running frequency of the compressor;
in this embodiment, when the air conditioner obtains the first evaporator temperature TC1, the first indoor temperature TA1 and the first operating frequency H1, a first difference Δ T1 between the first evaporator temperature TC1 and the first indoor temperature TA1 may be calculated first, that is, the first difference Δ T1 is TC1-TA 1; meanwhile, a corresponding first preset threshold M1 may also be determined according to the first operating frequency H1. For example, if the first operating frequency H1 does not exceed 20Hz (i.e., low frequency operation), the first preset threshold M1 may be between-4 and-2; if the first operating frequency H1 is between 20Hz and 40Hz (i.e., if the first operating frequency H1 is operating at an intermediate frequency), the first predetermined threshold M1 may be between-2 Hz and 2 Hz; if the first operating frequency H1 exceeds 40Hz (i.e., high frequency operation), the first preset threshold M1 may be between 2 and 4. Of course, the relationship between the first operating frequency H1 and the first preset threshold M1 may also be in other forms. When the first difference Δ T1 and the first predetermined threshold M1 are obtained, further state analysis can be performed according to the first difference Δ T1 and the first predetermined threshold M1. It should be noted that the indoor temperature and the evaporator temperature are obtained in real time, and therefore the difference between the two temperatures can also be calculated in real time, or can be calculated every other time, for example, every 2 seconds.
And the first difference 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.
In this embodiment, when the first difference Δ T1 and the first preset threshold M1 are obtained, the first difference Δ T1 may be compared with the first preset threshold M1, and if the first difference Δ T1 is less than or equal to the first preset threshold M1 and the first difference Δ T1 is less than or equal to the first preset threshold M1 continues for a first preset duration, it is determined that the indoor heat exchanger is currently in the overheat state. For example, if the first preset threshold M1 is taken as 2, the first preset time period is taken as 2 minutes, and the current first difference Δ T1 is less than 2, and the duration of "less than" exceeds 2 minutes, it is determined that the indoor heat exchanger is currently in the overheated state. If the first difference Δ T1 is greater than the first preset threshold M1, the indoor heat exchanger is considered to be in a normal state; in addition, if the first difference Δ T1 is less than or equal to the first preset threshold M1 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 threshold within a certain period (different from the duration described above, the total duration may be the sum of the 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 this embodiment, the air conditioner performs heating operation, obtains 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, and obtains an operation frequency of a compressor of the air conditioner; determining a current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature and the compressor operating frequency. Through the mode, the evaporator temperature, the indoor temperature and the compressor running frequency of the indoor heat exchanger are obtained when the air conditioner is in heating operation, and the state of the indoor heat exchanger is judged according to the evaporator temperature, the indoor temperature and the compressor running frequency, so that the negative influence of small refrigerant flow on temperature detection in the heating operation of the air conditioner can be avoided as much as possible, the state of the indoor heat exchanger can be effectively and accurately determined, and the air conditioner can be accurately controlled.
Based on the first embodiment described above, a second embodiment of the air conditioner control method of the present invention is proposed.
In this embodiment, the current state of the indoor heat exchanger includes an overheat state, and after the step S20, the method further includes:
in step S30, the indoor heat exchanger is in an overheated state, and the air conditioner is overheated.
In this embodiment, when it is determined that the indoor heat exchanger is in the overheat state, it is necessary to perform overheat processing (adjustment) on the air conditioner 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; and parameters such as the running frequency, the air volume and the like of the air conditioner compressor can be adjusted.
Further, the step of performing the overheating treatment on the air conditioner includes:
and controlling the opening of an expansion valve of the air conditioner to open for a preset number of steps every preset adjusting period.
In this embodiment, when the air conditioner is subjected to overheating treatment, the expansion valve may be controlled to be opened, and a periodic continuous opening manner is adopted, so that the condition that the adjustment amplitude is too large and deviates from the current set working condition seriously or other abnormalities are avoided. 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. In practice, of course, 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, when the indoor heat exchanger is determined to be in the overheating state, the air conditioner is subjected to overheating treatment, so that the indoor heat exchanger in the overheating state can be timely and effectively subjected to corresponding treatment, and the running stability of the air conditioner is favorably improved.
Based on the second embodiment described above, a third embodiment of the air conditioner control method of the present invention is proposed.
In this embodiment, after 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 acquiring a second operating frequency of a compressor of the air conditioner;
in this embodiment, after determining that the indoor heat exchanger is in an overheat state and performing overheat processing, the air conditioner still obtains the current indoor heat exchanger and the current indoor temperature, which may be referred to as a second evaporator temperature TC2 and a second indoor temperature TA2, respectively, for convenience of description; meanwhile, the operation frequency of the compressor of the air conditioner may be obtained again, and for convenience of description, it is referred to as a second operation frequency H2. In this case, since the compressor frequency may not be adjusted when the air conditioner is subjected to the overheat processing, the first operating frequency H1 may be substantially the same as the second operating frequency H2.
Determining a second difference value between the second evaporator temperature and the second indoor temperature, and determining a corresponding second preset threshold according to the second operating frequency;
when the second evaporator temperature TC2, the second indoor temperature TA2 and the second operating frequency H2 are obtained, a second difference Δ T2 between the second evaporator temperature TC2 and the second indoor temperature TA2 can be further determined; meanwhile, the corresponding second preset threshold M2 is determined according to the second operating frequency H2, and the value relationship between the second operating frequency H2 and the second preset threshold M2 may also be defined by itself, which is not described herein again.
And the second difference is greater than a second preset threshold value and lasts for a second preset time, and the indoor heat exchanger is determined to be recovered to be normal.
After the air conditioner is subjected to overheating treatment, if it is detected that a second difference value delta T2 between a second evaporator temperature TC2 and a second indoor temperature TA2 is greater than a second preset threshold value M2 and the situation that the second difference value delta T2 is greater than a second preset threshold value M2 lasts for a second preset time period, it is determined that the indoor heat exchanger is currently recovered to be normal. It should be noted that, in practice, the first operating frequency H1 may be the same as the second operating frequency H2, and in order to ensure the effectiveness of the overheating process, when the second preset threshold is determined according to the second operating frequency H2, the second preset threshold may be set to be greater than the first preset threshold, that is, the second preset threshold M2 is greater than the first preset threshold M2 in the first embodiment (for example, M2 is M1+ 1); for example, the first preset threshold is 2, the second preset threshold is 3, the second preset time period is 2 minutes, after the overheating treatment is performed, if it is detected that the difference Δ T2 between the second evaporator temperature TC2 and the second indoor temperature TA2 is greater than 3, and the duration "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 of the air conditioner to open for the preset number of steps every preset adjustment period" as exemplified in the second embodiment, if it is detected that the second difference Δ T2 is greater than the second preset threshold M2 and the second difference Δ T2 is greater than the second preset threshold M2 for the second preset time period, it is determined that the indoor heat exchanger is currently recovered to be normal, at this time, the periodic continuous opening of the expansion valve is stopped, and the expansion valve is kept to operate at the current opening degree. By the mode, after the air conditioner is controlled, the state of the indoor heat exchanger is analyzed through the temperature of the evaporator, the difference value of the indoor temperature and the running frequency of the compressor 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 situation that the indoor heat exchanger deviates from the current set working condition seriously or generates other abnormalities due to overlarge adjusting amplitude is avoided.
Based on the second embodiment described above, a fourth embodiment of the air conditioner control method of the present invention is proposed.
In this embodiment, after the 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 acquiring a third operating frequency of a compressor of the air conditioner and an opening degree of an expansion valve;
in this embodiment, after determining that the indoor heat exchanger is in an overheat state and performing overheat processing, the air conditioner still obtains the current indoor heat exchanger and the current indoor temperature, which may be referred to as a third evaporator temperature TC3 and a third indoor temperature TA3, respectively, for convenience of description; meanwhile, the operation frequency of the compressor of the air conditioner may be obtained again, and is referred to as a third operation frequency H3 for convenience of description. It should be noted that, since there is a possibility that the compressor frequency is not adjusted when the air conditioner is subjected to the overheat processing, the first operating frequency H1 may be substantially the same as the third operating frequency H3. 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 current opening degree of the expansion valve of the air conditioner is also acquired.
Determining a third difference value between the temperature of the third evaporator and the temperature in the third room and the opening degree of the expansion valve, and determining a corresponding third preset threshold according to the third operating frequency;
after obtaining the third evaporator temperature TC3, the third indoor temperature TA3, the third operating frequency H3 and the opening degree of the expansion valve, a third difference Δ T3 between the third evaporator temperature TC3 and the third indoor temperature TA3 can be further determined; meanwhile, a corresponding third preset threshold value M3 is determined according to the third operating frequency H3, and the value relationship between the third operating frequency H3 and the third preset threshold value M3 may also be defined by itself, which is not described herein again; in practice, the third operating frequency H3 may be the same as the first operating frequency H1, and when the two are equal, the third preset threshold M3 may take the same value as the first preset threshold M1, so that the state of the indoor heat exchanger is analyzed with the same determination criterion.
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 a third preset threshold value.
In this embodiment, after the air conditioner is subjected to the overheating process, if the opening degree of the expansion valve is detected to be greater than the preset opening degree, and the third difference Δ T3 between the third evaporator temperature TC3 and the second indoor temperature TA3 is smaller than or equal to the third preset threshold value M3, it may be determined that the current opening degree of the expansion valve is a relatively large value but the problem of the overheating state of the indoor heat exchanger cannot be solved, and at this time, there may be a problem that other parts of the air conditioner have a problem, such as insufficient refrigerant of the air conditioner, an abnormal flow control function of the expansion valve, and the air conditioner is determined to be in an abnormal state. Through the above manner, in this embodiment, after the expansion valve is controlled, the state of the air conditioner is analyzed through the third difference Δ T3 between the third evaporator temperature TC3 and the second indoor temperature TA3 and the opening degree of the expansion valve, and an abnormality of the air conditioner is discovered in time, so as to avoid a situation that the indoor heat exchanger cannot be recovered even after a severe adjustment is performed.
Furthermore, after the air conditioner is determined to be in an abnormal state, in order to avoid a more serious problem caused by abnormal operation of the air conditioner, the air conditioner can be controlled to stop, and meanwhile, an alarm can be given; 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 controlled to stop, the problem that the air conditioner operates abnormally to cause more serious is avoided, and meanwhile, the alarm can be given to the user to prompt the user to overhaul the air conditioner in time.
Further, the air conditioner may also periodically count the abnormal situations and generate a corresponding abnormal log, for example, count the abnormal situations 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 time of starting the air conditioner when each abnormal event occurs, and the like. When the abnormal log is obtained, the abnormal log can be sent to the corresponding user terminal so that the 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:
the temperature acquisition module 10 is configured to acquire 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, and acquire a first operating frequency of a compressor of the air conditioner when the air conditioner is in heating operation;
a state determining module 20, configured to determine a current state of the indoor heat exchanger according to the first evaporator temperature, the first indoor temperature, and the first operating frequency.
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 status determining module 20 includes:
the temperature difference determining unit is used for determining a first difference value between the first evaporator temperature and the first indoor temperature and determining a corresponding first preset threshold according to the first operating frequency;
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 length.
Further, the current state of the indoor heat exchanger includes an overheat state, and the control device of the air conditioner further includes:
and the air conditioner control module is used for carrying out overheating treatment on the air conditioner when the indoor heat exchanger is in an overheating state.
The air conditioner control module includes:
and the period control unit is used for controlling the opening of the expansion valve of the air conditioner to be opened by preset steps every preset adjusting period.
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 obtain a second operating frequency of a compressor of the air conditioner; determining a second difference value between the second evaporator temperature and the second indoor temperature, and determining a corresponding second preset threshold according to the second operating frequency;
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.
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 obtain a third operating frequency of a compressor of the air conditioner and an opening degree of an expansion valve; determining a third difference value between the temperature of the third evaporator and the temperature in the third room and the opening degree of the expansion valve, and determining a corresponding third preset threshold according to the third operating frequency;
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 third 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.
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 the air conditioner as described above.
The method implemented when the computer program is executed may refer to various embodiments of the control method of the air conditioner of the present invention, and will not be 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 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 enabling a terminal device (e.g., 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 (9)
1. A control method of an air conditioner, characterized by comprising:
the air conditioner is operated in a heating mode, the temperature of a first evaporator of an indoor heat exchanger of the air conditioner and the temperature of a first room of an area where the indoor heat exchanger is located are obtained, and the first operating frequency of a compressor of the air conditioner is obtained;
determining a first difference value between the first evaporator temperature and the first indoor temperature, and determining a corresponding first preset threshold according to the first operating frequency;
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.
2. The method of claim 1, wherein the first difference is less than a first predetermined threshold for a first predetermined period of time, and wherein the step of determining that the indoor heat exchanger is in an overheat state further comprises:
the indoor heat exchanger is in an overheating state and performs overheating treatment on the air conditioner.
3. The control method of an air conditioner according to claim 2, wherein the step of performing the overheating treatment on the air conditioner comprises:
and controlling the opening of an expansion valve of the air conditioner to open for a preset number of steps every preset adjusting period.
4. The method of controlling an air conditioner according to claim 2, wherein the indoor heat exchanger is in an overheat state, and after the step of overheating the air conditioner, 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 acquiring a second operating frequency of a compressor of the air conditioner;
determining a second difference value between the second evaporator temperature and the second indoor temperature, and determining a corresponding second preset threshold according to the second operating frequency;
and the second difference is greater than a second preset threshold value and lasts for a second preset time, and the indoor heat exchanger is determined to be recovered to be normal.
5. The method of controlling an air conditioner according to claim 2, wherein the indoor heat exchanger is in an overheat state, and after the step of overheating the air conditioner, 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 acquiring a third operating frequency of a compressor of the air conditioner and an opening degree of an expansion valve;
determining a third difference value between the third evaporator temperature and the third indoor temperature and the opening degree of the expansion valve, and determining a corresponding third preset threshold according to the third operating frequency;
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 a third preset threshold value.
6. The control method of an air conditioner according to claim 5, 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.
7. 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 when the air conditioner is in heating operation, and acquiring a first operating frequency of a compressor of the air conditioner;
the state determining module is used for determining a first difference value between the first evaporator temperature and the first indoor temperature and determining a corresponding first preset threshold according to the first operating frequency; and determining that the indoor heat exchanger is in an overheat state when the first difference is smaller than a first preset threshold value and lasts for a first preset time.
8. 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 6.
9. A readable storage medium, having a computer program 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 6.
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