CN109282424B - Air conditioner control method and air conditioner control device - Google Patents

Air conditioner control method and air conditioner control device Download PDF

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Publication number
CN109282424B
CN109282424B CN201811102938.9A CN201811102938A CN109282424B CN 109282424 B CN109282424 B CN 109282424B CN 201811102938 A CN201811102938 A CN 201811102938A CN 109282424 B CN109282424 B CN 109282424B
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indoor unit
difference
air conditioner
outlet temperature
inlet temperature
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CN109282424A (en
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吴晓鸿
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis

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  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
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  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner control method and an air conditioner control device. The air conditioner control method comprises the following steps: when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value a is less than or equal to a first threshold value; and when the judgment result is negative, judging that the electronic expansion valve has a fault, and prompting the fault. The air conditioner control method can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.

Description

Air conditioner control method and air conditioner control device
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner control method and an air conditioner control device.
Background
The multi-connected air conditioner is favored by the majority of users in recent years, and compared with the traditional air conditioner, the multi-connected air conditioner has obvious advantages in the aspects of energy-saving control, one-driving-more technology and the like, and has particularly outstanding characteristics in comfort and convenience. In order to ensure comfort and system reliability, an electronic expansion valve is often used to accurately control refrigerant flow, so that the electronic expansion valve of the indoor unit plays an important role in an air conditioning system.
However, in the construction and installation, the electronic expansion valve is damaged due to factors such as impurities, or the electronic expansion valve is damaged due to the fact that the electronic expansion valve reaches the service life in daily use, and along with the damage of the internal machine electronic expansion valve, various serious consequences are often brought to the whole air conditioning system. Therefore, the judgment of the damaged electronic expansion valve of the internal machine is particularly important.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide an air conditioner control method.
Another aspect of the present invention is to provide an air conditioner control apparatus.
In view of the above, the present invention provides a method for controlling an air conditioner, the air conditioner including an indoor unit, the indoor unit including an electronic expansion valve, the method including: when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value a is less than or equal to a first threshold value; and when the judgment result is negative, judging that the electronic expansion valve has a fault, and prompting the fault.
According to the air conditioner control method, the temperature sensors are respectively arranged at the inlet and the outlet of the indoor unit of the air conditioner, when the air conditioner is powered on and stopped, the inlet temperature and the outlet temperature of the indoor unit are detected, the temperature difference a between the inlet temperature and the outlet temperature is calculated, whether the absolute value of the difference a is smaller than or equal to a first threshold value or not is judged, the inlet temperature and the outlet temperature of the indoor unit are close to the ambient temperature because the electronic expansion valve is closed or adjusted to the minimum opening degree when the air conditioner is stopped and no refrigerant passes through the pipeline, when the absolute value of the difference a between the inlet temperature and the outlet temperature of the indoor unit is larger than the first threshold value, the electronic expansion valve is proved to have faults, such as blockage faults, and when the electronic expansion valve is judged to have faults, the indoor unit and the outdoor unit are controlled to. Wherein the first threshold is greater than and close to zero, as will be understood by those skilled in the art, but is not limited to a specific value. By the technical scheme of the invention, the failure condition of the electronic expansion valve of the indoor unit can be detected in time, and the prompt is carried out after the failure of the electronic expansion valve is detected, so that the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit is avoided, the system operation is more reliable, the service life of the air conditioner is prolonged, and the satisfaction degree of users is improved.
In the above technical solution, preferably, the method further includes: the number of the indoor units is multiple; when the difference value a corresponding to each indoor unit is judged to be smaller than or equal to a first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode; recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2; after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating the difference b between the outlet temperature and the inlet temperature; judging whether the difference b is greater than or equal to a second threshold value; when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X1 are/is abnormal, and performing fault reminding; and the difference value between the total number of the indoor units and the preset number is greater than or equal to 1.
In the technical scheme, the air conditioner comprises a plurality of indoor units, such as a multi-connected air conditioner, and when the difference a between the inlet temperature and the outlet temperature of each indoor unit is smaller than or equal to a first threshold value, the system enters the next judgment. Specifically, the outdoor unit is normally started, one or more indoor units X1 are set to start the cooling mode, the starting time is a preset duration, wherein the number (i.e., the preset number) of the indoor units X1 must satisfy that the difference between the total number of the indoor units and the preset number is greater than or equal to 1; the preset time is set to be related to the current operation conditions of the air conditioner, such as frequency and the like, and the air conditioner is normally operated after being started so as to obtain the inlet temperature and the outlet temperature of the indoor unit X1 in a normal refrigeration state, and whether the difference b between the outlet temperature and the inlet temperature is greater than or equal to a second threshold value or not is judged, if the judgment result is negative, the states of an inlet temperature sensing bulb and an outlet temperature sensing bulb for detecting the inlet temperature and the outlet temperature of the indoor unit X1 are judged to be abnormal, such as the incorrect placing position of the temperature sensing bulb, the breakage of a capillary tube of the temperature sensing bulb and the like, at the moment, the indoor unit X1 and the outdoor unit are controlled to carry out fault reminding, or a fault code is. Wherein the second threshold is greater than zero. By the technical scheme of the invention, whether the temperature sensing bulb of the indoor unit is abnormal can be detected in time, fault prompt is carried out when the temperature sensing bulb is detected to be abnormal, and the problem that the performance of the temperature sensing bulb affects the detection of the fault of the electronic expansion valve is avoided, so that the air conditioner is prevented from being further damaged due to long-term operation of the air conditioner under the condition of the fault of the electronic expansion valve, and the system is more reliable in operation.
In any of the above technical solutions, preferably, the method further includes: when the difference b corresponding to each indoor unit X1 is judged to be larger than or equal to a second threshold value, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value c is less than or equal to a third threshold value; and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and prompting the fault.
In the technical scheme, when the difference value b corresponding to each indoor unit X1 is judged to be larger than or equal to the second threshold value, the temperature sensing bulb of the indoor unit XI can be judged to be normal, and the system enters the next judgment. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X2 are detected, generally, the electronic expansion valve of the indoor unit X2 is normal, when the indoor unit X1 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X2 are not affected, therefore, by calculating the temperature difference c between the two, and determining whether the absolute value of the difference c is less than or equal to the third threshold, it can be determined whether the electronic expansion valve of the indoor unit X2 is abnormal, if the absolute value of the difference c is greater than the third threshold, it is determined that the electronic expansion valve is in fault, and when the electronic expansion valve is in fault, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does. By the technical scheme of the invention, the failure condition of the electronic expansion valve of the indoor unit can be detected in time, and the prompt is carried out after the failure of the electronic expansion valve is detected, so that the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit is avoided, the system operation is more reliable, the service life of the air conditioner is prolonged, and the satisfaction degree of users is improved.
In any of the above technical solutions, preferably, the method further includes: when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be less than or equal to the third threshold value, controlling each indoor unit X1 to be turned off, and controlling each indoor unit X2 to start a refrigeration mode; after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference d between the outlet temperature and the inlet temperature; judging whether the difference d is greater than or equal to a fourth threshold value; and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X2 are/is abnormal, and reminding the fault.
In the technical scheme, when the absolute value of the difference value c corresponding to each unopened indoor unit X2 is less than or equal to the third threshold, it can be determined that the electronic expansion valve of the indoor unit X2 is normal, and the system can enter the next determination. Specifically, the indoor unit X1 with the refrigeration mode being started is closed, the indoor unit X2 which is not started is controlled to start the refrigeration mode, the outdoor unit is operated for a preset time length, the outdoor unit is normally started, the inlet temperature and the outlet temperature of the indoor unit X2 are detected, the temperature difference d between the outlet temperature and the inlet temperature is calculated, whether the difference d is larger than or equal to a fourth threshold value is judged, if the judgment result is negative, it is indicated that the inlet temperature sensing bulb and the outlet temperature sensing bulb of the indoor unit X2 are in fault, if the temperature sensing bulb is placed incorrectly, capillary tubes of the temperature sensing bulb are broken, and the like, at the moment, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or fault codes are. By the technical scheme of the invention, whether the temperature sensing bulb of the indoor unit is abnormal can be detected in time, fault prompt is carried out when the temperature sensing bulb is detected to be abnormal, and the problem that the performance of the temperature sensing bulb affects the detection of the fault of the electronic expansion valve is avoided, so that the air conditioner is prevented from being further damaged due to long-term operation of the air conditioner under the condition of the fault of the electronic expansion valve, and the system is more reliable in operation.
In any of the above technical solutions, preferably, the method further includes: when the difference d corresponding to each indoor unit X2 is judged to be larger than or equal to the fourth threshold, the inlet temperature and the outlet temperature of the indoor unit X1 are obtained, and the difference e between the inlet temperature and the outlet temperature is calculated; judging whether the absolute value of the difference value e is less than or equal to a fifth threshold value; and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X1 has a fault, and prompting the fault.
In the technical scheme, when the difference d corresponding to each indoor unit X2 with the refrigeration mode started is greater than or equal to the fourth threshold, that the indoor unit X2 thermal bulb is normal is indicated, and the system enters the next judgment. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X1 are detected, generally, the electronic expansion valve of the indoor unit X1 is normal, when the indoor unit X2 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X1 are not affected, therefore, by calculating the temperature difference e between the two, and judging whether the absolute value of the difference e is less than or equal to the fifth threshold, it can be judged whether the electronic expansion valve of the indoor unit X1 is abnormal, if the absolute value of the difference e is greater than the fifth threshold, it is said that the electronic expansion valve has a fault, when the electronic expansion valve has a fault, the indoor unit X1 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does not. By the technical scheme of the invention, the failure condition of the electronic expansion valve of the indoor unit can be detected in time, and the prompt is carried out after the failure of the electronic expansion valve is detected, so that the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit is avoided, the system operation is more reliable, the service life of the air conditioner is prolonged, and the satisfaction degree of users is improved.
The invention also provides a control device of an air conditioner, the air conditioner comprises an indoor unit, the indoor unit comprises an electronic expansion valve, and the device comprises: a memory for storing a computer program; a processor for executing a computer program to: when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value a is less than or equal to a first threshold value; and when the judgment result is negative, judging that the electronic expansion valve has a fault, and prompting the fault.
According to the air conditioner control device, the temperature sensors are respectively arranged at the inlet and the outlet of the indoor unit of the air conditioner, when the air conditioner is powered on and stopped, the inlet temperature and the outlet temperature of the indoor unit are detected, the temperature difference a between the inlet temperature and the outlet temperature is calculated, whether the absolute value of the difference a is smaller than or equal to a first threshold value or not is judged, the inlet temperature and the outlet temperature of the indoor unit are close to the ambient temperature because the electronic expansion valve is closed or adjusted to the minimum opening degree when the air conditioner is stopped and no refrigerant passes through the pipeline, when the absolute value of the difference a between the inlet temperature and the outlet temperature of the indoor unit is larger than the first threshold value, the electronic expansion valve is proved to have faults, such as blockage faults, and when the electronic expansion valve is judged to have faults, the indoor unit and the outdoor unit are controlled to. Wherein the first threshold is greater than and close to zero, as will be understood by those skilled in the art, but is not limited to a specific value. By the technical scheme of the invention, the failure condition of the electronic expansion valve of the indoor unit can be detected in time, and the prompt is carried out after the failure of the electronic expansion valve is detected, so that the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit is avoided, the system operation is more reliable, the service life of the air conditioner is prolonged, and the satisfaction degree of users is improved.
In the above technical solution, preferably, the number of the indoor units is plural; a processor further configured to execute a computer program to: when the difference value a corresponding to each indoor unit is judged to be smaller than or equal to a first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode; recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2; after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating the difference b between the outlet temperature and the inlet temperature; judging whether the difference b is greater than or equal to a second threshold value; when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X1 are/is abnormal, and performing fault reminding; and the difference value between the total number of the indoor units and the preset number is greater than or equal to 1.
In the technical scheme, the air conditioner comprises a plurality of indoor units, such as a multi-connected air conditioner, and when the difference a between the inlet temperature and the outlet temperature of each indoor unit is smaller than or equal to a first threshold value, the system enters the next judgment. Specifically, the outdoor unit is normally started, one or more indoor units X1 are set to start the cooling mode, the starting time is a preset duration, wherein the number (i.e., the preset number) of the indoor units X1 must satisfy that the difference between the total number of the indoor units and the preset number is greater than or equal to 1; the preset time is set to be related to the current operation conditions of the air conditioner, such as frequency and the like, and the air conditioner is normally operated after being started so as to obtain the inlet temperature and the outlet temperature of the indoor unit X1 in a normal refrigeration state, and whether the difference b between the outlet temperature and the inlet temperature is greater than or equal to a second threshold value or not is judged, if the judgment result is negative, the states of an inlet temperature sensing bulb and an outlet temperature sensing bulb for detecting the inlet temperature and the outlet temperature of the indoor unit X1 are judged to be abnormal, such as the incorrect placing position of the temperature sensing bulb, the breakage of a capillary tube of the temperature sensing bulb and the like, at the moment, the indoor unit X1 and the outdoor unit are controlled to carry out fault reminding, or a fault code is. Wherein the second threshold is greater than zero. By the technical scheme of the invention, whether the temperature sensing bulb of the indoor unit is abnormal can be detected in time, fault prompt is carried out when the temperature sensing bulb is detected to be abnormal, and the problem that the performance of the temperature sensing bulb affects the detection of the fault of the electronic expansion valve is avoided, so that the air conditioner is prevented from being further damaged due to long-term operation of the air conditioner under the condition of the fault of the electronic expansion valve, and the system is more reliable in operation.
In any of the above technical solutions, preferably, the processor is further configured to execute the computer program to: when the difference b corresponding to each indoor unit X1 is judged to be larger than or equal to a second threshold value, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value c is less than or equal to a third threshold value; and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and prompting the fault.
In the technical scheme, when the difference value b corresponding to each indoor unit X1 is judged to be larger than or equal to the second threshold value, the temperature sensing bulb of the indoor unit XI can be judged to be normal, and the system enters the next judgment. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X2 are detected, generally, the electronic expansion valve of the indoor unit X2 is normal, when the indoor unit X1 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X2 are not affected, therefore, by calculating the temperature difference c between the two, and determining whether the absolute value of the difference c is less than or equal to the third threshold, it can be determined whether the electronic expansion valve of the indoor unit X2 is abnormal, if the absolute value of the difference c is greater than the third threshold, it is determined that the electronic expansion valve is in fault, and when the electronic expansion valve is in fault, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does. By the technical scheme of the invention, the failure condition of the electronic expansion valve of the indoor unit can be detected in time, and the prompt is carried out after the failure of the electronic expansion valve is detected, so that the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit is avoided, the system operation is more reliable, the service life of the air conditioner is prolonged, and the satisfaction degree of users is improved.
In any of the above technical solutions, preferably, the processor is further configured to execute the computer program to: when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be less than or equal to the third threshold value, controlling each indoor unit X1 to be turned off, and controlling each indoor unit X2 to start a refrigeration mode; after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference d between the outlet temperature and the inlet temperature; judging whether the difference d is greater than or equal to a fourth threshold value; and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X2 are/is abnormal, and reminding the fault.
In the technical scheme, when the absolute value of the difference value c corresponding to each unopened indoor unit X2 is less than or equal to the third threshold, it can be determined that the electronic expansion valve of the indoor unit X2 is normal, and the system can enter the next determination. Specifically, the indoor unit X1 with the refrigeration mode being started is closed, the indoor unit X2 which is not started is controlled to start the refrigeration mode, the outdoor unit is operated for a preset time length, the outdoor unit is normally started, the inlet temperature and the outlet temperature of the indoor unit X2 are detected, the temperature difference d between the outlet temperature and the inlet temperature is calculated, whether the difference d is larger than or equal to a fourth threshold value is judged, if the judgment result is negative, it is indicated that the inlet temperature sensing bulb and the outlet temperature sensing bulb of the indoor unit X2 are in fault, if the temperature sensing bulb is placed incorrectly, capillary tubes of the temperature sensing bulb are broken, and the like, at the moment, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or fault codes are. By the technical scheme of the invention, whether the temperature sensing bulb of the indoor unit is abnormal can be detected in time, fault prompt is carried out when the temperature sensing bulb is detected to be abnormal, and the problem that the performance of the temperature sensing bulb affects the detection of the fault of the electronic expansion valve is avoided, so that the air conditioner is prevented from being further damaged due to long-term operation of the air conditioner under the condition of the fault of the electronic expansion valve, and the system is more reliable in operation.
In any of the above technical solutions, preferably, the processor is further configured to execute the computer program to: when the difference d corresponding to each indoor unit X2 is judged to be larger than or equal to the fourth threshold, the inlet temperature and the outlet temperature of the indoor unit X1 are obtained, and the difference e between the inlet temperature and the outlet temperature is calculated; judging whether the absolute value of the difference value e is less than or equal to a fifth threshold value; and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X1 has a fault, and prompting the fault.
In the technical scheme, when the difference d corresponding to each indoor unit X2 with the refrigeration mode started is greater than or equal to the fourth threshold, that the indoor unit X2 thermal bulb is normal is indicated, and the system enters the next judgment. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X1 are detected, generally, the electronic expansion valve of the indoor unit X1 is normal, when the indoor unit X2 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X1 are not affected, therefore, by calculating the temperature difference e between the two, and judging whether the absolute value of the difference e is less than or equal to the fifth threshold, it can be judged whether the electronic expansion valve of the indoor unit X1 is abnormal, if the absolute value of the difference e is greater than the fifth threshold, it is said that the electronic expansion valve has a fault, when the electronic expansion valve has a fault, the indoor unit X1 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does not. By the technical scheme of the invention, the failure condition of the electronic expansion valve of the indoor unit can be detected in time, and the prompt is carried out after the failure of the electronic expansion valve is detected, so that the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit is avoided, the system operation is more reliable, the service life of the air conditioner is prolonged, and the satisfaction degree of users is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating an air conditioner control method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an air conditioner control method according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating an air conditioner control method according to still another embodiment of the present invention;
fig. 4 is a flowchart illustrating an air conditioner control method according to still another embodiment of the present invention;
fig. 5 is a flowchart illustrating an air conditioner control method according to still another embodiment of the present invention;
fig. 6 is a schematic diagram illustrating an air conditioner control apparatus according to an embodiment of the present invention;
FIG. 7a illustrates a schematic diagram of an air conditioner according to an embodiment of the present invention;
figure 7b shows a schematic diagram of an air conditioner indoor unit according to an embodiment of the present invention;
fig. 7c is a flowchart illustrating an air conditioner control method according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 7a to 7b is:
702 outdoor unit, 704 indoor unit.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 1, a flow chart of an air conditioner control method according to an embodiment of the present invention is schematically shown. The air conditioner comprises an indoor unit, the indoor unit comprises an electronic expansion valve, and the air conditioner control method comprises the following steps:
step 102, when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating a difference value a between the inlet temperature and the outlet temperature;
104, judging whether the absolute value of the difference value a is less than or equal to a first threshold value;
and 106, judging that the electronic expansion valve has a fault when the judgment result is negative, and reminding the fault.
The invention provides an air conditioner control method, which is characterized in that temperature sensors are respectively arranged at the inlet and outlet positions of an indoor unit of an air conditioner, when the air conditioner is powered on and stops, the inlet temperature and the outlet temperature of the indoor unit are detected, the temperature difference a between the inlet temperature and the outlet temperature is calculated, whether the absolute value of the difference a is smaller than or equal to a first threshold value or not is judged, because an electronic expansion valve is closed or adjusted to the minimum opening degree when the air conditioner stops, no refrigerant passes through a pipeline, the inlet temperature and the outlet temperature of the indoor unit are both close to the ambient temperature, when the absolute value of the difference a between the inlet temperature and the outlet temperature of the indoor unit is larger than the first threshold value, the electronic expansion valve is proved to have faults, such as blockage faults, and when the electronic expansion valve is judged to have faults, the indoor unit and. Wherein the first threshold is greater than and close to zero, as will be understood by those skilled in the art, but is not limited to a specific value. The control method can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.
As shown in fig. 2, a flow chart of an air conditioner control method according to another embodiment of the present invention is schematically shown. The air conditioner comprises a plurality of indoor units, each indoor unit comprises an electronic expansion valve, and the air conditioner control method comprises the following steps:
step 202, when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating a difference value a between the inlet temperature and the outlet temperature;
step 204, judging whether the absolute value of the difference value a is less than or equal to a first threshold value;
step 206, when the judgment result is negative, judging that the electronic expansion valve has a fault, and performing fault reminding;
step 208, when the difference value a corresponding to each indoor unit is judged to be less than or equal to the first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode;
recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2;
step 210, after a preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating a difference b between the outlet temperature and the inlet temperature;
step 212, determining whether the difference b is greater than or equal to a second threshold;
step 214, when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb for detecting the indoor unit X1 are abnormal, and performing fault reminding;
and the difference value between the total number of the indoor units and the preset number is greater than or equal to 1.
In this embodiment, the air conditioner includes a plurality of indoor units, such as a multi-split air conditioner, and when the difference a between the inlet temperature and the outlet temperature of each indoor unit is less than or equal to the first threshold, the system proceeds to the next determination. Specifically, the outdoor unit is normally started, one or more indoor units X1 are set to start the cooling mode, the starting time is a preset duration, wherein the number (i.e., the preset number) of the indoor units X1 must satisfy that the difference between the total number of the indoor units and the preset number is greater than or equal to 1; the preset time is set to be related to the current operation conditions of the air conditioner, such as frequency and the like, and the air conditioner is normally operated after being started so as to obtain the inlet temperature and the outlet temperature of the indoor unit X1 in a normal refrigeration state, and whether the difference b between the outlet temperature and the inlet temperature is greater than or equal to a second threshold value or not is judged, if the judgment result is negative, the states of an inlet temperature sensing bulb and an outlet temperature sensing bulb for detecting the inlet temperature and the outlet temperature of the indoor unit X1 are judged to be abnormal, such as the incorrect placing position of the temperature sensing bulb, the breakage of a capillary tube of the temperature sensing bulb and the like, at the moment, the indoor unit X1 and the outdoor unit are controlled to carry out fault reminding, or a fault code is. Wherein the second threshold is greater than zero. The control method can detect whether the temperature sensing bulb of the indoor unit is abnormal in time, and can prompt faults when the temperature sensing bulb is detected to be abnormal, so that the problem that the performance of the temperature sensing bulb affects the detection of the faults of the electronic expansion valve is avoided, the air conditioner is prevented from being operated for a long time under the condition that the electronic expansion valve is in fault, the air conditioner is prevented from being further damaged, and the system is more reliable in operation.
As shown in fig. 3, a flow chart of an air conditioner control method according to still another embodiment of the present invention is schematically shown. The air conditioner comprises a plurality of indoor units, each indoor unit comprises an electronic expansion valve, and the air conditioner control method comprises the following steps:
step 302, when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature;
step 304, judging whether the absolute value of the difference value a is less than or equal to a first threshold value;
step 306, judging that the electronic expansion valve has a fault when the judgment result is negative, and performing fault reminding;
308, when the difference value a corresponding to each indoor unit is judged to be smaller than or equal to the first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode;
recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2;
step 310, after a preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating a difference b between the outlet temperature and the inlet temperature;
step 312, determining whether the difference b is greater than or equal to a second threshold;
step 314, when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb for detecting the indoor unit X1 are abnormal, and performing fault reminding;
the difference value between the total number of the indoor units and the preset number is greater than or equal to 1;
step 316, when the difference b corresponding to each indoor unit X1 is judged to be greater than or equal to the second threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature;
step 318, judging whether the absolute value of the difference value c is less than or equal to a third threshold value;
and step 320, judging that the electronic expansion valve of the indoor unit X2 has a fault when the judgment result is negative, and reminding the fault.
In this embodiment, when the difference b corresponding to each indoor unit X1 is determined to be greater than or equal to the second threshold, it may be determined that the thermal bulb of the indoor unit XI is normal, and the system proceeds to the next determination. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X2 are detected, generally, the electronic expansion valve of the indoor unit X2 is normal, when the indoor unit X1 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X2 are not affected, therefore, by calculating the temperature difference c between the two, and determining whether the absolute value of the difference c is less than or equal to the third threshold, it can be determined whether the electronic expansion valve of the indoor unit X2 is abnormal, if the absolute value of the difference c is greater than the third threshold, it is determined that the electronic expansion valve is in fault, and when the electronic expansion valve is in fault, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does. The control method can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.
As shown in fig. 4, a flowchart of an air conditioner control method according to still another embodiment of the present invention is shown. The air conditioner comprises a plurality of indoor units, each indoor unit comprises an electronic expansion valve, and the air conditioner control method comprises the following steps:
step 402, when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature;
step 404, judging whether the absolute value of the difference value a is less than or equal to a first threshold value;
step 406, when the judgment result is negative, judging that the electronic expansion valve has a fault, and performing fault reminding;
step 408, when the difference value a corresponding to each indoor unit is judged to be less than or equal to the first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode;
recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2;
step 410, after a preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating a difference b between the outlet temperature and the inlet temperature;
step 412, determining whether the difference b is greater than or equal to a second threshold;
step 414, when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb for detecting the indoor unit X1 are abnormal, and performing fault reminding;
the difference value between the total number of the indoor units and the preset number is greater than or equal to 1;
step 416, when the difference b corresponding to each indoor unit X1 is judged to be greater than or equal to the second threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature;
step 418, determining whether the absolute value of the difference value c is less than or equal to a third threshold value;
step 420, when the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and performing fault reminding;
step 422, when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be less than or equal to the third threshold, controlling each indoor unit X1 to shut down, and controlling each indoor unit X2 to start a refrigeration mode;
step 424, after a preset time period, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating a difference d between the outlet temperature and the inlet temperature;
step 426, determining whether the difference d is greater than or equal to a fourth threshold;
and 428, when the judgment result is negative, judging that the inlet thermal bulb and/or the outlet thermal bulb of the indoor unit X2 are/is abnormal, and performing fault reminding.
In this embodiment, when the absolute value of the difference c corresponding to each unopened indoor unit X2 is less than or equal to the third threshold, it can be determined that the electronic expansion valve of the indoor unit X2 is normal, and the system can proceed to the next determination. Specifically, the indoor unit X1 with the refrigeration mode being started is closed, the indoor unit X2 which is not started is controlled to start the refrigeration mode, the outdoor unit is operated for a preset time length, the outdoor unit is normally started, the inlet temperature and the outlet temperature of the indoor unit X2 are detected, the temperature difference d between the outlet temperature and the inlet temperature is calculated, whether the difference d is larger than or equal to a fourth threshold value is judged, if the judgment result is negative, it is indicated that the inlet temperature sensing bulb and the outlet temperature sensing bulb of the indoor unit X2 are in fault, if the temperature sensing bulb is placed incorrectly, capillary tubes of the temperature sensing bulb are broken, and the like, at the moment, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or fault codes are. The control method can detect whether the temperature sensing bulb of the indoor unit is abnormal in time, and can prompt faults when the temperature sensing bulb is detected to be abnormal, so that the problem that the performance of the temperature sensing bulb affects the detection of the faults of the electronic expansion valve is avoided, the air conditioner is prevented from being operated for a long time under the condition that the electronic expansion valve is in fault, the air conditioner is prevented from being further damaged, and the system is more reliable in operation.
As shown in fig. 5, a flowchart of an air conditioner control method according to still another embodiment of the present invention is shown. The air conditioner comprises a plurality of indoor units, each indoor unit comprises an electronic expansion valve, and the air conditioner control method comprises the following steps:
step 502, when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature;
step 504, judging whether the absolute value of the difference value a is less than or equal to a first threshold value;
step 506, when the judgment result is negative, judging that the electronic expansion valve has a fault, and performing fault reminding;
step 508, when the difference value a corresponding to each indoor unit is judged to be less than or equal to the first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode;
recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2;
step 510, after a preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating a difference b between the outlet temperature and the inlet temperature;
step 512, determining whether the difference b is greater than or equal to a second threshold;
step 514, when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb for detecting the indoor unit X1 are abnormal, and performing fault reminding;
the difference value between the total number of the indoor units and the preset number is greater than or equal to 1;
step 516, when the difference b corresponding to each indoor unit X1 is judged to be greater than or equal to the second threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature;
step 518, determining whether the absolute value of the difference value c is less than or equal to a third threshold value;
step 520, when the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and performing fault reminding;
step 522, when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be less than or equal to the third threshold, controlling each indoor unit X1 to shut down, and controlling each indoor unit X2 to start a refrigeration mode;
step 524, after a preset time period, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating a difference d between the outlet temperature and the inlet temperature;
step 526, determining whether the difference d is greater than or equal to a fourth threshold;
step 528, when the judgment result is negative, judging that the inlet thermal bulb and/or the outlet thermal bulb of the indoor unit X2 are/is abnormal, and performing fault reminding;
step 530, when the difference d corresponding to each indoor unit X2 is judged to be greater than or equal to the fourth threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating the difference e between the inlet temperature and the outlet temperature;
step 532, determining whether the absolute value of the difference e is less than or equal to a fifth threshold;
and step 534, judging that the electronic expansion valve of the indoor unit X1 has a fault when the judgment result is negative, and reminding the fault.
In this embodiment, when the difference d corresponding to each indoor unit X2 that starts the cooling mode is greater than or equal to the fourth threshold, it indicates that the thermal bulb of the indoor unit X2 is normal, and the system proceeds to the next determination. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X1 are detected, generally, the electronic expansion valve of the indoor unit X1 is normal, when the indoor unit X2 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X1 are not affected, therefore, by calculating the temperature difference e between the two, and judging whether the absolute value of the difference e is less than or equal to the fifth threshold, it can be judged whether the electronic expansion valve of the indoor unit X1 is abnormal, if the absolute value of the difference e is greater than the fifth threshold, it is said that the electronic expansion valve has a fault, when the electronic expansion valve has a fault, the indoor unit X1 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does not. The control method can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.
As shown in fig. 6, a schematic diagram of an air conditioner control device according to an embodiment of the present invention. Wherein, the air conditioner includes indoor set, and indoor set includes electronic expansion valve, and this air conditioner controlling means 600 includes:
a memory 602 for storing a computer program;
a processor 604 for executing a computer program to: when the air conditioner is powered on and stopped, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value a is less than or equal to a first threshold value; and when the judgment result is negative, judging that the electronic expansion valve has a fault, and prompting the fault.
The air conditioner control device 600 provided by the invention is characterized in that temperature sensors are respectively arranged at the inlet and outlet positions of an indoor unit of an air conditioner, when the air conditioner is powered on and stopped, the inlet temperature and the outlet temperature of the indoor unit are detected, the temperature difference a between the inlet temperature and the outlet temperature is calculated, whether the absolute value of the difference a is smaller than or equal to a first threshold value or not is judged, because an electronic expansion valve is closed or adjusted to the minimum opening degree when the air conditioner is stopped, no refrigerant passes through a pipeline, the inlet temperature and the outlet temperature of the indoor unit are both close to the ambient temperature, when the absolute value of the difference a between the inlet temperature and the outlet temperature of the indoor unit is larger than the first threshold value, the electronic expansion valve is proved to have faults, such as blockage faults, and when the electronic expansion valve is judged to have faults, the indoor unit and. Wherein the first threshold is greater than and close to zero, as will be understood by those skilled in the art, but is not limited to a specific value. The control device can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.
In one embodiment of the present invention, preferably, the number of the indoor units is plural; a processor 604, further for executing a computer program to: when the difference value a corresponding to each indoor unit is judged to be smaller than or equal to a first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode; recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2; after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating the difference b between the outlet temperature and the inlet temperature; judging whether the difference b is greater than or equal to a second threshold value; when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X1 are/is abnormal, and performing fault reminding; and the difference value between the total number of the indoor units and the preset number is greater than or equal to 1.
In this embodiment, the air conditioner includes a plurality of indoor units, such as a multi-split air conditioner, and when the difference a between the inlet temperature and the outlet temperature of each indoor unit is less than or equal to the first threshold, the system proceeds to the next determination. Specifically, the outdoor unit is normally started, one or more indoor units X1 are set to start the cooling mode, the starting time is a preset duration, wherein the number (i.e., the preset number) of the indoor units X1 must satisfy that the difference between the total number of the indoor units and the preset number is greater than or equal to 1; the preset time is set to be related to the current operation conditions of the air conditioner, such as frequency and the like, and the air conditioner is normally operated after being started so as to obtain the inlet temperature and the outlet temperature of the indoor unit X1 in a normal refrigeration state, and whether the difference b between the outlet temperature and the inlet temperature is greater than or equal to a second threshold value or not is judged, if the judgment result is negative, the states of an inlet temperature sensing bulb and an outlet temperature sensing bulb for detecting the inlet temperature and the outlet temperature of the indoor unit X1 are judged to be abnormal, such as the incorrect placing position of the temperature sensing bulb, the breakage of a capillary tube of the temperature sensing bulb and the like, at the moment, the indoor unit X1 and the outdoor unit are controlled to carry out fault reminding, or a fault code is. Wherein the second threshold is greater than zero. The control device can detect whether the temperature sensing bulb of the indoor unit is abnormal in time, and can prompt faults when the temperature sensing bulb is detected to be abnormal, so that the problem that the performance of the temperature sensing bulb affects the detection of the faults of the electronic expansion valve is avoided, the air conditioner is prevented from being operated for a long time under the condition that the electronic expansion valve is in fault, the air conditioner is prevented from being further damaged, and the system is more reliable in operation.
In one embodiment of the present invention, the processor 604 is further preferably configured to execute the computer program to: when the difference b corresponding to each indoor unit X1 is judged to be larger than or equal to a second threshold value, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value c is less than or equal to a third threshold value; and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and prompting the fault.
In this embodiment, when the difference b corresponding to each indoor unit X1 is determined to be greater than or equal to the second threshold, it may be determined that the thermal bulb of the indoor unit XI is normal, and the system proceeds to the next determination. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X2 are detected, generally, the electronic expansion valve of the indoor unit X2 is normal, when the indoor unit X1 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X2 are not affected, therefore, by calculating the temperature difference c between the two, and determining whether the absolute value of the difference c is less than or equal to the third threshold, it can be determined whether the electronic expansion valve of the indoor unit X2 is abnormal, if the absolute value of the difference c is greater than the third threshold, it is determined that the electronic expansion valve is in fault, and when the electronic expansion valve is in fault, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does. The control device can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.
In one embodiment of the present invention, the processor 604 is further preferably configured to execute the computer program to: when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be less than or equal to the third threshold value, controlling each indoor unit X1 to be turned off, and controlling each indoor unit X2 to start a refrigeration mode; after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference d between the outlet temperature and the inlet temperature; judging whether the difference d is greater than or equal to a fourth threshold value; and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X2 are/is abnormal, and reminding the fault.
In this embodiment, when the absolute value of the difference c corresponding to each unopened indoor unit X2 is less than or equal to the third threshold, it can be determined that the electronic expansion valve of the indoor unit X2 is normal, and the system can proceed to the next determination. Specifically, the indoor unit X1 with the refrigeration mode being started is closed, the indoor unit X2 which is not started is controlled to start the refrigeration mode, the outdoor unit is operated for a preset time length, the outdoor unit is normally started, the inlet temperature and the outlet temperature of the indoor unit X2 are detected, the temperature difference d between the outlet temperature and the inlet temperature is calculated, whether the difference d is larger than or equal to a fourth threshold value is judged, if the judgment result is negative, it is indicated that the inlet temperature sensing bulb and the outlet temperature sensing bulb of the indoor unit X2 are in fault, if the temperature sensing bulb is placed incorrectly, capillary tubes of the temperature sensing bulb are broken, and the like, at the moment, the indoor unit X2 and the outdoor unit are controlled to perform fault reminding, or fault codes are. The control device can detect whether the temperature sensing bulb of the indoor unit is abnormal in time, and can prompt faults when the temperature sensing bulb is detected to be abnormal, so that the problem that the performance of the temperature sensing bulb affects the detection of the faults of the electronic expansion valve is avoided, the air conditioner is prevented from being operated for a long time under the condition that the electronic expansion valve is in fault, the air conditioner is prevented from being further damaged, and the system is more reliable in operation.
In one embodiment of the present invention, the processor 604 is further preferably configured to execute the computer program to: when the difference d corresponding to each indoor unit X2 is judged to be larger than or equal to the fourth threshold, the inlet temperature and the outlet temperature of the indoor unit X1 are obtained, and the difference e between the inlet temperature and the outlet temperature is calculated; judging whether the absolute value of the difference value e is less than or equal to a fifth threshold value; and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X1 has a fault, and prompting the fault.
In this embodiment, when the difference d corresponding to each indoor unit X2 that starts the cooling mode is greater than or equal to the fourth threshold, it indicates that the thermal bulb of the indoor unit X2 is normal, and the system proceeds to the next determination. Specifically, the inlet temperature and the outlet temperature of other unopened indoor units X1 are detected, generally, the electronic expansion valve of the indoor unit X1 is normal, when the indoor unit X2 is opened for cooling, the inlet temperature and the outlet temperature of the indoor unit X1 are not affected, therefore, by calculating the temperature difference e between the two, and judging whether the absolute value of the difference e is less than or equal to the fifth threshold, it can be judged whether the electronic expansion valve of the indoor unit X1 is abnormal, if the absolute value of the difference e is greater than the fifth threshold, it is said that the electronic expansion valve has a fault, when the electronic expansion valve has a fault, the indoor unit X1 and the outdoor unit are controlled to perform fault reminding, or a fault code is displayed, and the whole machine does not. The control device can detect the failure condition of the electronic expansion valve of the indoor unit in time and prompt the failure condition after detecting the failure of the electronic expansion valve, thereby avoiding the further damage of the air conditioner caused by the failure of the electronic expansion valve of the indoor unit, ensuring the system to run more reliably, prolonging the service life of the air conditioner and improving the satisfaction degree of users.
The specific embodiment is as follows: the control method for the self-checking function of the electronic expansion valve of the multi-split air conditioner indoor unit is provided, wherein a multi-split air conditioner system is shown in fig. 7a, the multi-split air conditioner system is composed of a plurality of outdoor units 702 and a plurality of indoor units 704, temperature sensors are respectively arranged at the inlet and outlet positions of the evaporator of each indoor unit 704, as shown in fig. 7b, an inlet temperature sensor T2a detects an inlet temperature value as T2a, an outlet temperature sensor T2b detects an outlet temperature value as T2b, and an internal unit electronic expansion valve EXV. The flow chart of the control method is shown in fig. 7c, and specifically includes the following steps:
step 702, powering on the multi-split air conditioner system and shutting down the multi-split air conditioner system;
step 704, detecting that | T2b-T2a | is less than or equal to a of each indoor unit;
step 706, reporting the fault of the indoor unit, reporting the fault of the outdoor unit and stopping the whole machine, wherein the indoor unit does not meet the condition;
step 708, if the conditions are met, setting the indoor unit X1 to start the refrigeration mode, and normally starting the outdoor unit for T;
wherein, the number of the indoor units X1 can be one or more than one, but the number of the indoor units X1 is required to be less than or equal to the total number n-1 of the indoor units;
step 710, detecting that the indoor unit X1, T2b-T2a are more than or equal to b;
step 712, the indoor unit X1 not meeting the condition reports the fault, the outdoor unit reports the fault, and the whole machine is shut down;
step 714, if the conditions are met, detecting other unopened indoor units X2, wherein | T2b-T2a |, is less than or equal to c; if the indoor unit does not meet the condition, executing step 706; if yes, go to step 716;
step 716, closing the indoor unit X1, opening the indoor unit X2 except the indoor unit X1 to enter a refrigeration mode, and normally starting the outdoor unit for T;
step 718, detecting that the indoor unit X2 is detected, and T2b-T2a is not less than d;
step 720, the indoor unit X2 reports the fault and the outdoor unit reports the fault when the condition is not met, and the whole machine is shut down;
step 722, if the conditions are met, detecting that the indoor unit X1 is less than or equal to e in the I T2b-T2a I; if the indoor unit does not meet the condition, executing step 706; if yes, go to step 724;
in step 724, the computer is normally started.
The control method provided by the invention can detect the fault condition of the electronic expansion valve of the indoor unit in time, and further damage of the system caused by the fault of the electronic expansion valve of the indoor unit is avoided, so that the system is more reliable to operate.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A control method of an air conditioner, wherein the air conditioner comprises an indoor unit, the indoor unit comprises an electronic expansion valve, and the method comprises the following steps:
when the air conditioner is powered on and shut down, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature;
judging whether the absolute value of the difference value a is smaller than or equal to a first threshold value;
when the judgment result is negative, judging that the electronic expansion valve has a fault, and performing fault reminding;
the number of the indoor units is multiple;
when the difference value a corresponding to each indoor unit is judged to be smaller than or equal to the first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode;
recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2;
after a preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating a difference b between the outlet temperature and the inlet temperature;
judging whether the difference b is greater than or equal to a second threshold value;
and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X1 are/is abnormal, and performing fault reminding.
2. The air conditioner controlling method according to claim 1,
the difference value between the total number of the indoor units and the preset number is greater than or equal to 1.
3. The air conditioner control method according to claim 2, further comprising:
when the difference b corresponding to each indoor unit X1 is judged to be larger than or equal to the second threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature;
judging whether the absolute value of the difference value c is smaller than or equal to a third threshold value;
and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and prompting the fault.
4. The air conditioner control method according to claim 3, further comprising:
when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be smaller than or equal to the third threshold value, controlling each indoor unit X1 to be turned off, and controlling each indoor unit X2 to start a refrigeration mode;
after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference d between the outlet temperature and the inlet temperature;
judging whether the difference d is greater than or equal to a fourth threshold value;
and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X2 are/is abnormal, and performing fault reminding.
5. The air conditioner control method according to claim 4, further comprising:
when the difference d corresponding to each indoor unit X2 is judged to be larger than or equal to the fourth threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating the difference e between the inlet temperature and the outlet temperature;
judging whether the absolute value of the difference value e is smaller than or equal to a fifth threshold value;
and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X1 has a fault, and prompting the fault.
6. An air conditioner control device, the air conditioner includes indoor set, indoor set includes electronic expansion valve, its characterized in that, the device includes:
a memory for storing a computer program;
a processor for executing the computer program to:
when the air conditioner is powered on and shut down, acquiring the inlet temperature and the outlet temperature of the indoor unit, and calculating the difference a between the inlet temperature and the outlet temperature; judging whether the absolute value of the difference value a is smaller than or equal to a first threshold value; when the judgment result is negative, judging that the electronic expansion valve has a fault, and performing fault reminding;
the number of the indoor units is multiple;
the processor further to execute the computer program to:
when the difference value a corresponding to each indoor unit is judged to be smaller than or equal to the first threshold value, controlling the outdoor unit to start up, and controlling a preset number of indoor units to start a refrigeration mode;
recording the indoor unit with the refrigeration mode started as an indoor unit X1, and recording the indoor unit without the refrigeration mode started as an indoor unit X2;
after a preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating a difference b between the inlet temperature and the outlet temperature;
judging whether the difference b is greater than or equal to a second threshold value;
and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X1 are/is abnormal, and performing fault reminding.
7. The air conditioner control device according to claim 6,
the difference value between the total number of the indoor units and the preset number is greater than or equal to 1.
8. The air conditioner control apparatus according to claim 7, wherein the processor is further configured to execute the computer program to:
when the difference b corresponding to each indoor unit X1 is judged to be larger than or equal to the second threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference c between the inlet temperature and the outlet temperature;
judging whether the absolute value of the difference value c is smaller than or equal to a third threshold value;
and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X2 has a fault, and prompting the fault.
9. The air conditioner control apparatus according to claim 8, wherein the processor is further configured to execute the computer program to:
when the absolute value of the difference value c corresponding to each indoor unit X2 is judged to be smaller than or equal to the third threshold value, controlling each indoor unit X1 to be turned off, and controlling each indoor unit X2 to start a refrigeration mode;
after the preset time, acquiring the inlet temperature and the outlet temperature of the indoor unit X2, and calculating the difference d between the inlet temperature and the outlet temperature;
judging whether the difference d is greater than or equal to a fourth threshold value;
and when the judgment result is negative, judging that the inlet temperature sensing bulb and/or the outlet temperature sensing bulb of the indoor unit X2 are/is abnormal, and performing fault reminding.
10. The air conditioner control apparatus according to claim 9, wherein the processor is further configured to execute the computer program to:
when the difference d corresponding to each indoor unit X2 is judged to be larger than or equal to the fourth threshold, acquiring the inlet temperature and the outlet temperature of the indoor unit X1, and calculating the difference e between the inlet temperature and the outlet temperature;
judging whether the absolute value of the difference value e is smaller than or equal to a fifth threshold value;
and if the judgment result is negative, judging that the electronic expansion valve of the indoor unit X1 has a fault, and prompting the fault.
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