Anomaly detection and control method and device of air conditioner, air conditioner and storage medium

Abstract

The application discloses an air conditioner abnormality detection and control method and device, an air conditioner and a storage medium. The air conditioner comprises a temperature controller, an indoor unit and an outdoor unit. The temperature controller is connected with the outdoor unit and the indoor unit through a four-way valve signal line. The method comprises the following steps: if the air conditioner operates in a heating mode, determining whether the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced according to the comparison results of the high-pressure temperature, the exhaust temperature and the compressor frequency of the air conditioner and the set deviation value; if it is determined that the refrigerant amount is suddenly reduced, determining whether the four-way valve signal line connected with the indoor unit of the temperature controller is abnormal according to the current high-pressure temperature and the preset standard high-pressure temperature; and if the four-way valve signal line is abnormal, an abnormality is reminded. According to the scheme, if the refrigerant amount flowing through the compressor is suddenly reduced, whether the four-way valve signal line connected with the indoor unit of the temperature controller is abnormal is judged according to the high-pressure temperature and the standard high-pressure temperature, and if the four-way valve signal line is abnormal, a reminder is given, so that the air conditioner can be prevented from operating in an abnormal state, and the reliability of the air conditioner is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an abnormality detection and control method and device of an air conditioner, the air conditioner and a storage medium, and more particularly to an abnormality detection and control method and device of a four-way valve signal line of a non-communication air conditioner unit, the air conditioner and a storage medium. BACKGROUND

[0002] With the progress of science and technology and the improvement of living quality, heat pump systems are gradually popularized in general families. The existing common heat pump unit often needs to be controlled by a fixedly matched temperature controller, unit outdoor unit and indoor unit for each set of heat pump system. For a non-communication air conditioner unit, the control among the temperature controller, indoor unit and outdoor unit is independent, and only switch signals are used for control, which has the advantages of convenient installation, independent modules and flexible matching, and is popular in the air conditioner market and occupies a large market.

[0003] The indoor unit and outdoor unit of the non-communication air conditioner unit are both based on the signals sent by the temperature controller to act, wherein the four-way valve control signal needs to be sent to the indoor unit and the outdoor unit. However, if the four-way valve signal line of the temperature controller and the indoor unit is disconnected or other abnormalities occur, the indoor unit fails to receive the four-way valve control signal, but the outdoor unit cannot identify whether the indoor unit receives the four-way valve control signal, thereby possibly causing abnormal control of the unit. How to reasonably judge whether the four-way valve signal line of the temperature controller is abnormal in the case of no communication with the temperature controller and timely remind the user to avoid abnormal operation of the unit is still a problem to be solved.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The present application aims to provide an abnormality detection and control method and device of an air conditioner, the air conditioner and a storage medium, to solve the problem in the prior art that if the four-way valve signal line of the temperature controller and the indoor unit of the non-communication air conditioner unit is disconnected or other abnormalities occur, the indoor unit fails to receive the four-way valve control signal, but the outdoor unit cannot identify whether the indoor unit receives the four-way valve control signal, thereby possibly causing abnormal control of the unit, so as to achieve the effect that if the amount of refrigerant flowing through the air conditioner compressor is suddenly reduced in the heating mode of the air conditioner, whether the four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined according to the high-pressure temperature and the preset standard high-pressure temperature, and if abnormal, an abnormality is reminded, so as to avoid the air conditioner running in an abnormal state for a long time, and the reliability of the air conditioner operation is improved.

[0006] The application provides an abnormality detection and control method of an air conditioner, the air conditioner comprising a temperature controller, an indoor unit and an outdoor unit, the temperature controller having a first four-way valve signal line and a second four-way valve signal line; the temperature controller being connected to the outdoor unit through the first four-way valve signal line, and being connected to the indoor unit through the second four-way valve signal line; the outdoor unit having an outdoor electronic expansion valve and a four-way valve; the indoor unit having an indoor electronic expansion valve; the temperature controller sending a four-way valve control signal to the outdoor unit through the first four-way valve control line, and sending a four-way valve control signal to the indoor unit through the second four-way valve control line; the method comprising: if the outdoor unit receives the four-way valve control signal sent by the temperature controller through the first four-way valve control line, confirming that the air conditioner operates in a heating mode; in the case of confirming that the air conditioner operates in the heating mode, obtaining a temperature of a high-pressure pipeline on a compressor exhaust side of the air conditioner, denoted as a high-pressure temperature; obtaining a temperature at a compressor exhaust port of the air conditioner, denoted as an exhaust temperature; obtaining an operating frequency of the compressor of the air conditioner, denoted as a compressor frequency; comparing the high-pressure temperature, the exhaust temperature and the compressor frequency with a set deviation value respectively, and determining whether a refrigerant amount flowing through the compressor of the air conditioner suddenly decreases according to a comparison result; if it is determined that the refrigerant amount flowing through the compressor of the air conditioner suddenly decreases, determining whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and a preset standard high-pressure temperature; and if it is determined that the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal, reporting fault information that the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal.

[0007] In some embodiments, a preset data table including a standard high-pressure temperature, an exhaust temperature, and a compressor frequency is established in advance, wherein the standard high-pressure temperature corresponds to the exhaust temperature and the compressor frequency, and the corresponding standard high-pressure temperature can be determined according to the exhaust temperature and the compressor frequency; the high-pressure temperature, the exhaust temperature, and the compressor frequency are compared with a set deviation value respectively, and whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced is determined according to the comparison result, including: a difference between the current high-pressure temperature and the high-pressure temperature obtained before a first preset time is recorded as a high-pressure temperature fluctuation value; a difference between the current exhaust temperature and the exhaust temperature obtained before the first preset time is recorded as an exhaust temperature fluctuation value; a difference between the current compressor frequency and the compressor frequency obtained before the first preset time is recorded as a compressor frequency fluctuation value; it is determined whether the high-pressure temperature fluctuation value is greater than a high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to an exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency set deviation value; if yes, it is determined that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced; if no, the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature are updated into the preset data table; then the high-pressure temperature, the exhaust temperature, and the compressor frequency are reacquired, and whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced is continuously determined.

[0008] In some embodiments, according to the current high-pressure temperature and the preset standard high-pressure temperature, whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined, including: according to the current exhaust temperature and the compressor frequency, the corresponding standard high-pressure temperature is obtained from the preset data table; it is determined whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than a standard high-pressure temperature set deviation value; if yes, it is determined that the high-pressure temperature of the air conditioner is abnormal, and then whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined according to the high-pressure temperature; if no, the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature are updated into the preset data table; then the high-pressure temperature, the exhaust temperature, and the compressor frequency are reacquired, and whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced is continuously determined.

[0009] In some embodiments, determining whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the high-pressure temperature includes: setting the opening degree of the outdoor electronic expansion valve to the maximum opening degree, and then obtaining the current high-pressure temperature, denoted as a first high-pressure temperature; obtaining the current high-pressure temperature again after a second preset time, denoted as a second high-pressure temperature; determining whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than a first high-pressure temperature set difference; if yes, determining that the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal; and if no, determining that the outdoor electronic expansion valve is blocked, reporting fault information that the outdoor electronic expansion valve is blocked, and controlling the air conditioner to stop running.

[0010] In some embodiments, determining whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the high-pressure temperature includes: setting the opening degree of the outdoor electronic expansion valve to the maximum opening degree, and then obtaining the current high-pressure temperature, denoted as a first high-pressure temperature; obtaining the current high-pressure temperature again after a second preset time, denoted as a second high-pressure temperature; determining whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than a first high-pressure temperature set difference; if yes, determining that the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal; and if no, determining that the outdoor electronic expansion valve is blocked, reporting fault information that the outdoor electronic expansion valve is blocked, and controlling the air conditioner to stop running.

[0011] In some embodiments, the processing unit is further configured to pre-establish a preset data table comprising a standard high-pressure temperature, an exhaust temperature, and a compressor frequency, wherein the standard high-pressure temperature corresponds to the exhaust temperature and the compressor frequency, and the corresponding standard high-pressure temperature can be determined according to the exhaust temperature and the compressor frequency; and the processing unit compares the high-pressure temperature, the exhaust temperature, and the compressor frequency with a set deviation value respectively, and determines whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, including: taking the difference between the current high-pressure temperature and the high-pressure temperature obtained before a first preset time as the high-pressure temperature fluctuation value; taking the difference between the current exhaust temperature and the exhaust temperature obtained before the first preset time as the exhaust temperature fluctuation value; taking the difference between the current compressor frequency and the compressor frequency obtained before the first preset time as the compressor frequency fluctuation value; determining whether the high-pressure temperature fluctuation value is greater than a high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to an exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency set deviation value; if yes, it is determined that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced; if no, the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature are updated into the preset data table; and then the high-pressure temperature, the exhaust temperature, and the compressor frequency are reacquired, and the determination of whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced is continued.

[0012] In some embodiments, the processing unit determines whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and a preset standard high-pressure temperature, including: obtaining the corresponding standard high-pressure temperature from the preset data table according to the current exhaust temperature and the compressor frequency; determining whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than a standard high-pressure temperature set deviation value; if yes, it is determined that the high-pressure temperature of the air conditioner is abnormal, and then whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined according to the high-pressure temperature; and if no, the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature are updated into the preset data table; and then the high-pressure temperature, the exhaust temperature, and the compressor frequency are reacquired, and the determination of whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced is continued.

[0013] In some embodiments, the processing unit determines whether the four-way valve signal line connected to the indoor unit of the temperature controller is abnormal according to the high-pressure temperature, including: setting the opening degree of the outdoor electronic expansion valve to the maximum opening degree, then obtaining the current high-pressure temperature, denoted as a first high-pressure temperature; after a second preset time, obtaining the current high-pressure temperature again, denoted as a second high-pressure temperature; determining whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than a first high-pressure temperature set difference; if yes, it is determined that the four-way valve signal line connected to the indoor unit of the temperature controller is abnormal; if no, it is determined that the outdoor electronic expansion valve is blocked, and the fault information that the outdoor electronic expansion valve is blocked is reported, and the air conditioner is controlled to stop.

[0014] To match the above device, the application further provides an air conditioner, including: the above-mentioned air conditioner abnormality detection and control device.

[0015] To match the above method, the application further provides a storage medium, including a stored program, wherein when the program runs, the device where the storage medium is located executes the above-mentioned air conditioner abnormality detection and control method.

[0016] Therefore, in the scheme of the application, when the communication-free air conditioner unit operates in the heating mode, the temperature of the high-pressure pipeline on the discharge side of the compressor is obtained, denoted as a high-pressure temperature; the temperature at the discharge port of the compressor is obtained, denoted as a discharge temperature; the operating frequency of the compressor is obtained, denoted as a compressor frequency; according to the comparison result of the high-pressure temperature, the discharge temperature, and the compressor frequency with the set difference, it is determined whether the amount of refrigerant flowing through the air conditioner compressor is suddenly reduced; if it is determined that the amount of refrigerant is suddenly reduced, it is further determined whether the four-way valve signal line connected to the indoor unit of the temperature controller is abnormal according to the current high-pressure temperature and the preset standard high-pressure temperature, and if it is abnormal, a fault warning is performed. By comparing the high-pressure temperature when the air conditioner operates in the heating mode with the set difference, it is determined whether the four-way valve signal line of the temperature controller is abnormal; then, according to the high-pressure temperature and the standard high-pressure temperature, it is determined whether the four-way valve signal line connected to the indoor unit of the temperature controller is abnormal, and if it is abnormal, a fault warning is performed, so that the disconnection or abnormality of the signal line of the temperature controller is identified in time, the abnormality of the unit is avoided, and the reliability of the air conditioner is ensured.

[0017] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application.

[0018] The technical solutions of the application will be further described in detail below with the aid of drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1Flowchart of an embodiment of the method for detecting and controlling the air conditioner of the present application;

[0020] Figure 2 Flowchart of an embodiment of the method for determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the high-pressure temperature, the exhaust temperature, and the compressor frequency in the method of the present application;

[0021] Figure 3 Flowchart of an embodiment of the method for determining whether the high-pressure temperature is abnormal according to the high-pressure temperature and the preset standard high-pressure temperature in the method of the present application;

[0022] Figure 4 Flowchart of an embodiment of the method for determining whether the four-way valve signal line connected to the thermostat and the indoor unit is abnormal according to the high-pressure temperature in the method of the present application;

[0023] Figure 5 Structural diagram of an embodiment of the device for detecting and controlling the air conditioner of the present application;

[0024] Figure 6 Structural diagram of an embodiment of the air conditioner system of the air conditioner of the present application;

[0025] Figure 7 Flowchart of an embodiment of the method for detecting and controlling the four-way valve signal line of the air conditioner of the present application;

[0026] In combination with the drawings, the reference signs in the embodiments of the present application are as follows:

[0027] 1-high-pressure sensor; 2-gas-liquid separator; 3-outdoor-side heat exchanger; 4-thermostat; 5-indoor-side heat exchanger; 6-exhaust temperature sensor; 7-compressor; 8-indoor-unit electronic expansion valve; 9-outdoor-unit electronic expansion valve; 10-four-way reversing valve; 11-suction temperature sensor; 12-first four-way valve signal line; 13-second four-way valve signal line; 102-acquisition unit; 104-processing unit. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] Figure 6 Structural diagram of an embodiment of the air conditioner system of the air conditioner of the present application, as Figure 6As shown, the air conditioning system is a non-communication air conditioning unit, comprising a temperature controller 4, an outdoor unit and an indoor unit. The outdoor unit is composed of a high-pressure temperature sensor 1, a gas-liquid separator 2, an outdoor-side heat exchanger 3, an exhaust temperature sensor 6, a compressor 7, an outdoor electronic expansion valve 9, a four-way reversing valve 10, and a suction temperature sensor 11. The indoor unit is composed of an indoor-side heat exchanger 5 and an indoor electronic expansion valve 8. The temperature controller 4 is connected with the outdoor unit through a first four-way valve signal line 12 and connected with the indoor unit through a second four-way valve signal line 13. The first signal line 12 and the second four-way valve signal line 13 are used to send the four-way valve control signal sent by the temperature controller 4 to the corresponding connected indoor unit and outdoor unit, respectively. The indoor electronic expansion valve 8 and the outdoor electronic expansion valve 9 are used for throttling control in heating or cooling mode, respectively. For a non-communication air conditioning unit, since the indoor unit and the outdoor unit are independently controlled, it is necessary to consider the matching of a third-party unit, so it is necessary to increase the control of the electronic expansion valve in the indoor unit and the outdoor unit. The high-pressure temperature sensor 1 is used to detect the temperature of the high-pressure pipeline at the exhaust side of the air conditioning compressor, and the exhaust temperature sensor 6 is used to detect the temperature at the exhaust port of the air conditioning compressor.

[0030] Under normal circumstances, when the air conditioning unit is started in heating mode controlled by the temperature controller 4, the temperature controller 4 sends the four-way valve control signal to the outdoor unit through the first four-way valve signal line 12 and to the indoor unit through the second four-way valve signal line 13. When heating starts, the indoor electronic expansion valve 8 is set to maximum opening, and the high-temperature and high-pressure refrigerant gas discharged by the compressor 7 enters the indoor-side heat exchanger 5 through the four-way reversing valve 10, releases heat, and is condensed into refrigerant liquid. After being throttled by the outdoor electronic expansion valve 9, it enters the outdoor-side heat exchanger 3 for heat exchange and evaporates into refrigerant gas. Then it enters the gas-liquid separator 2 through the four-way reversing valve 10 for gas-liquid separation, and finally returns to the compressor 7.

[0031] If the indoor unit and the outdoor unit do not receive the four-way valve control signal sent by the temperature controller 4, it is considered that the unit is in cooling mode. In cooling mode, the outdoor electronic expansion valve 9 is set to maximum opening, and the high-temperature and high-pressure refrigerant gas discharged by the compressor 7 enters the outdoor-side heat exchanger 3 through the four-way reversing valve 10, releases heat, and is condensed into refrigerant liquid. After being throttled by the indoor electronic expansion valve 8, it enters the indoor-side heat exchanger 5 for heat exchange and evaporates into refrigerant gas. Then it enters the gas-liquid separator 2 through the four-way reversing valve 10 for gas-liquid separation, and finally returns to the compressor 7.

[0032] If the temperature controller 4 is disconnected from the four-way valve signal line of the indoor unit, that is, the second four-way valve signal line 13 is abnormal, the indoor unit cannot receive the four-way valve control signal. If the heating mode is turned on at this time, the outdoor unit normally receives the four-way valve control signal, but the outdoor unit cannot identify whether the indoor unit receives the four-way valve control signal. At this time, the outdoor unit electronic expansion valve 9 of the outdoor unit will be throttled according to the control logic in the heating mode. The indoor unit electronic expansion valve 8 of the indoor unit will be throttled according to the control logic in the cooling mode because the indoor unit cannot receive the four-way valve control signal. Thus, the two electronic expansion valves are throttled at the same time, which causes the amount of circulating refrigerant in the system to decrease sharply, thereby affecting the operating efficiency of the air conditioner, causing abnormal operation of the air conditioning system, and even causing the air conditioner to fail to operate normally.

[0033] Therefore, the present application provides an air conditioner abnormality detection and control method. By detecting whether the amount of refrigerant flowing through the air conditioner compressor decreases sharply when the air conditioner operates in the heating mode, if the amount of refrigerant decreases sharply, it is determined whether the indoor unit electronic expansion valve is abnormal according to the high pressure temperature and the preset standard high pressure temperature. Thus, whether the temperature controller and the indoor unit connection four-way valve signal line are abnormal can be quickly and effectively identified, and problems such as low operating efficiency and abnormal operation of the air conditioning system caused by a sharp decrease in refrigerant can be avoided.

[0034] According to an embodiment of the present application, an air conditioner abnormality detection and control method is provided. The air conditioner is a non-communication air conditioning unit, which includes a temperature controller, an indoor unit, and an outdoor unit. The temperature controller has a first four-way valve signal line and a second four-way valve signal line. The temperature controller is connected to the corresponding temperature controller terminal on the mainboard of the outdoor unit through the first four-way valve signal line, and is connected to the corresponding temperature controller terminal on the mainboard of the indoor unit through the second four-way valve signal line. The outdoor unit has an outdoor unit electronic expansion valve and a four-way valve. The indoor unit has an indoor unit electronic expansion valve. The temperature controller sends a four-way valve control signal to the outdoor unit through the first four-way valve control line, and sends a four-way valve control signal to the indoor unit through the second four-way valve control line. The four-way valve control signals sent by the temperature controller to the indoor unit and the outdoor unit are consistent. For a non-communication temperature controller, if the unit operates in the heating mode, a 24V electrical signal is generally sent. For example, when heating, the temperature controller sends a 24V electrical signal to the indoor unit and the outdoor unit. When cooling, the temperature controller does not send the electrical signal, and the indoor unit and the outdoor unit receive a 0V signal. Therefore, if the unit does not receive the 24V electrical signal of the four-way valve, it is considered to be in the cooling mode. The outdoor unit controls the outdoor unit electronic expansion valve and the four-way valve to act according to the four-way valve control signal. The indoor unit controls the indoor unit electronic expansion valve to act according to the four-way valve control signal. Figure 1A flowchart of an embodiment of the method of the application is shown. The abnormality detection and control method of the air conditioner can include: steps S110 to S150.

[0035] At step S110, if the outdoor unit receives a four-way valve control signal sent by the temperature controller through the first four-way valve control line, it is determined that the air conditioner is operating in a heating mode.

[0036] At step S120, if the air conditioner is operating in a heating mode, the temperature of the high-pressure pipeline on the compressor discharge side of the air conditioner is obtained, denoted as the high-pressure temperature, specifically, the pressure on the high-pressure side detected by the high-pressure sensor, and the temperature corresponding to the high-pressure pressure; the temperature at the compressor discharge port of the air conditioner is obtained, denoted as the discharge temperature, and there is a certain temperature attenuation between the discharge temperature and the high-pressure temperature, and the high-pressure temperature is lower than the discharge temperature; the operating frequency of the compressor of the air conditioner is obtained, denoted as the compressor frequency; wherein, if the outdoor unit receives a four-way valve control signal sent by the temperature controller, it is determined that the air conditioner is operating in a heating mode.

[0037] At step S130, the high-pressure temperature, the discharge temperature, and the compressor frequency are compared with the set deviation value respectively, and it is determined whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result.

[0038] Before the air conditioner is formally operated, a preset data table including standard high-pressure temperature, discharge temperature, and compressor frequency is established in advance, wherein the standard high-pressure temperature corresponds to the discharge temperature and the compressor frequency, and the corresponding standard high-pressure temperature can be determined according to the discharge temperature and the compressor frequency.

[0039] In some embodiments, in step S130, the high-pressure temperature, the discharge temperature, and the compressor frequency are compared with the set deviation value respectively, and the specific process of determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result is described in the following example.

[0040] Figure 2 A flowchart of an embodiment of the method of the application is shown. The abnormality detection and control method of the air conditioner can include: steps S110 to S150. Figure 2 As shown, in step S130, the high-pressure temperature, the discharge temperature, and the compressor frequency are compared with the set deviation value respectively, and the specific process of determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result includes: steps S210 to S240.

[0041] Step S210, the difference between the current high pressure temperature and the high pressure temperature obtained before the first preset time is recorded as the high pressure temperature fluctuation value; the difference between the current exhaust temperature and the exhaust temperature obtained before the first preset time is recorded as the exhaust temperature fluctuation value; the difference between the current compressor frequency and the compressor frequency obtained before the first preset time is recorded as the compressor frequency fluctuation value; wherein the first preset time is set to be short, and can be set to 10-15s.

[0042] Step S220, it is determined whether the high pressure temperature fluctuation value is greater than the high pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to the exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to the compressor frequency set deviation value.

[0043] Step S230, if yes, it is determined that the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced.

[0044] Step S240, if no, the exhaust temperature and the compressor frequency corresponding to the current high pressure temperature are updated to the preset data table; then the high pressure temperature, the exhaust temperature, and the compressor frequency are reacquired, and it is continuously determined whether the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced.

[0045] Specifically, after the air conditioning unit is installed, in the trial operation stage, the air conditioning unit establishes a data table of high pressure temperature, compressor frequency, and exhaust temperature based on the parameters in the trial operation process. Through the data table, the corresponding compressor frequency and exhaust temperature can be found according to the high pressure temperature, and the corresponding high pressure temperature can also be found according to the compressor frequency and the exhaust temperature. The high pressure temperature in the data table is used as a standard high pressure temperature, and functions to judge whether the high pressure temperature of the air conditioner is suddenly changed abnormally in the subsequent process.

[0046] If the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced, the high-temperature and high-pressure refrigerant amount discharged by the compressor is reduced, resulting in a sudden increase in the exhaust temperature and the high pressure temperature. The most direct influence is the high pressure temperature, which will change greatly in a short time. Although the exhaust temperature will also rise, it will not change greatly in a short time. Therefore, the high pressure temperature fluctuation value is greater than the high pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to the exhaust temperature set deviation value. The frequency regulation period of the compressor is generally 1-2min, and the first preset time is set to be short. Therefore, the compressor frequency will not change greatly in a short time, i.e. the compressor frequency fluctuation value is less than or equal to the compressor frequency set deviation value.

[0047] Figure 7 The flowchart of an embodiment of the air conditioner four-way valve signal line abnormality detection and control method of the application is shown in FIG. 1. Figure 7The four-way valve signal line abnormality detection and control method of the application comprises:

[0048] Step 1, during the trial operation stage after installation of the air conditioning unit, based on the parameters obtained during the trial operation, a high-pressure temperature T 高压 and a compressor frequency f and an exhaust temperature T 排气 data table is established, and then during operation of the air conditioning unit, step 2 is performed.

[0049] Step 2, during operation of the air conditioning unit, it is detected whether the four-way valve signal from the temperature controller is received by the outdoor unit, i.e. it is confirmed whether the heating mode of the air conditioning unit is started; if not, i.e. the heating mode of the air conditioning unit is not started, the air conditioning unit is controlled according to the normal adjustment logic; if yes, i.e. the heating mode of the air conditioning unit is started, step 3 is performed.

[0050] Step 3, the high-pressure temperature T 高压 , the compressor frequency f and the exhaust temperature T 排气 of the air conditioning unit are continuously detected, and it is judged whether the following conditions are simultaneously satisfied: the high-pressure temperature T 高压 fluctuation value > A, the exhaust temperature T 排气 fluctuation value ≤ B, and the compressor frequency H fluctuation value ≤ C. Wherein, A is a high-pressure temperature setting deviation value, B is an exhaust temperature setting deviation value, and C is a compressor frequency setting deviation value; the values of the high-pressure temperature T 高压 , the compressor frequency f and the exhaust temperature T 排气 are detected every t1 time, and the difference between the current detected value and the last detected value is taken as the fluctuation value.

[0051] If all the judgment conditions are simultaneously satisfied, it is considered that the refrigerant amount flowing through the compressor of the air conditioning unit is suddenly reduced, and then step 4 is performed; otherwise, the current detected high-pressure temperature T 高压 , the compressor frequency f and the exhaust temperature T 排气 are updated to the preset data table, and then step 3 is re-performed.

[0052] Wherein, the high-pressure temperature, the exhaust temperature and the frequency in the data table are corresponding, and the current detected high-pressure temperature T 高压The high-pressure temperature position corresponding to the current detected exhaust temperature and the compressor frequency in the data table is updated. For example, the current detected exhaust temperature is 55 DEG C, the compressor frequency is 60 Hz, the high-pressure temperature is 60 DEG C, the corresponding high-pressure temperature position of the exhaust temperature of 55 DEG C and the compressor frequency of 60 Hz in the data table is searched, the detected high-pressure temperature of 60 DEG C is updated to the position, and if there is no data before the position, the data is added. By updating the data table in real time, the data in the data table is always the latest data in the current state, so that the subsequent judgment of whether the high-pressure temperature is suddenly changed according to the data table is more accurate, the misjudgment is avoided, and the accuracy of detecting whether the four-way valve signal line of the temperature controller and the indoor unit is abnormal is improved.

[0053] According to the high-pressure temperature and the high-pressure temperature in the preset data table, whether the four-way valve signal line of the temperature controller and the indoor unit is abnormal is identified, so that the cause of the system abnormality is quickly located, the system is prevented from being in an abnormal state for a long time, and the reliability of the system is improved.

[0054] At step S140, if it is determined that the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced, whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined according to the current high-pressure temperature and the preset standard high-pressure temperature.

[0055] In some embodiments, the specific process of determining whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and the preset standard high-pressure temperature in step S140 is described below.

[0056] Figure 3 For an embodiment of the method of the application, according to the high-pressure temperature and the preset standard high-pressure temperature, whether the high-pressure temperature is abnormal is determined, and the flowchart is shown in Figure 3 According to the current high-pressure temperature and the preset standard high-pressure temperature, whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined in step S140, and the specific process includes steps S310 to S340.

[0057] In step S310, the corresponding standard high-pressure temperature is obtained from the preset data table according to the current exhaust temperature and the compressor frequency.

[0058] In step S320, whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than the standard high-pressure temperature set difference is determined. The standard high-pressure temperature set difference can be set to 2 DEG C.

[0059] If greater, it is determined that the high-pressure temperature of the air conditioner is abnormal, and then it is determined whether the second four-way valve signal line connected with the indoor unit of the temperature controller is abnormal according to the high-pressure temperature.

[0060] If less than or equal to, the current discharge temperature and the compressor frequency corresponding to the high-pressure temperature are updated to a preset data table, and then the high-pressure temperature, the discharge temperature, and the compressor frequency are re-acquired to continue determining whether the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced.

[0061] Since it is determined that the high-pressure temperature has a large change by judging the size relationship between the high-pressure temperature fluctuation value and the high-pressure temperature set deviation value, if the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than the standard high-pressure temperature set deviation value, it indicates that the high-pressure temperature mutation is obvious, and the system abnormality has a great influence on the operation of the air conditioner. At this time, it is necessary to further confirm the reason for the occurrence of such abnormal situation, that is, it is determined whether the four-way valve signal line connected with the indoor unit of the temperature controller is abnormal according to the high-pressure temperature, so as to locate the fault of the air conditioner and facilitate subsequent control or maintenance of the air conditioner.

[0062] In some embodiments, the specific process of determining whether the second four-way valve signal line connected with the indoor unit of the temperature controller is abnormal according to the high-pressure temperature in step S330 is described in the following exemplary description.

[0063] Figure 4 For an embodiment of the method of the present application for determining whether the four-way valve signal line connected with the indoor unit of the temperature controller is abnormal according to the high-pressure temperature, a flowchart is shown in Figure 4 The specific process of determining whether the second four-way valve signal line connected with the indoor unit of the temperature controller is abnormal according to the high-pressure temperature in step S330 includes steps S410 to S440.

[0064] Step S410 sets the opening degree of the outdoor electronic expansion valve to the maximum opening degree, and then acquires the current high-pressure temperature, which is recorded as the first high-pressure temperature. After a second preset time, the current high-pressure temperature is acquired again, which is recorded as the second high-pressure temperature. The second preset time can be set to 5 min.

[0065] Step S420 determines whether the difference between the current first high-pressure temperature and the second high-pressure temperature is greater than a first high-pressure temperature set deviation value. The first high-pressure temperature set deviation value can be set to 5℃.

[0066] If greater, it is determined that the second four-way valve signal line connected with the indoor unit of the temperature controller is abnormal.

[0067] Step S440, if less than or equal to, determine that the outdoor electronic expansion valve is blocked, report the fault information that the outdoor electronic expansion valve is blocked, and control the air conditioner to stop.

[0068] Specifically, if the reason for the sudden change of the high-pressure temperature is that the signal line of the four-way valve connected with the indoor unit is abnormal, that is, the indoor unit does not receive the control signal of the four-way valve, at this time, the indoor electronic expansion valve is still controlled by the indoor unit according to the refrigeration mode, and the outdoor electronic expansion valve is controlled by the outdoor unit according to the heating mode, so that the indoor electronic expansion valve and the outdoor electronic expansion valve are throttled at the same time under the current state, resulting in a sudden decrease in the system refrigerant amount. At this time, if the opening of the outdoor electronic expansion valve is set to the maximum, only the indoor electronic expansion valve is throttled thereafter, which is equivalent to reducing the throttling degree and increasing the refrigerant amount in the system circulation, so that the refrigerant amount flowing into the air conditioner compressor increases. Since the refrigerant amount changes most in the high-pressure temperature, the high-pressure temperature is reduced by increasing the refrigerant amount, so that after the second preset time, the high-pressure temperature has changed obviously, and at this time, the difference between the first high-pressure temperature and the second high-pressure temperature is greater than the first high-pressure temperature set difference. If the difference between the first high-pressure temperature and the second high-pressure temperature is less than or equal to the first high-pressure temperature set difference, it indicates that setting the opening of the outdoor electronic expansion valve to the maximum does not reduce the system throttling degree, and the refrigerant amount flowing into the air conditioner compressor does not increase, so at this time, it is considered that the outdoor electronic expansion valve is blocked, and the opening of the outdoor electronic expansion valve cannot affect the throttling degree due to the blockage.

[0069] Figure 7 The flowchart of an embodiment of the four-way valve signal line abnormality detection and control method of the air conditioner of the present application is shown in FIG. 1. Figure 7 As shown in FIG. 1, the four-way valve signal line abnormality detection and control method of the present application further comprises:

[0070] Step 4, obtaining the high-pressure temperature T corresponding to the current exhaust temperature and the compressor frequency from the data table 高压1 , judging whether |T 高压 -T 高压1 |> set value D, and the set value D can be 2℃. If |T 高压 -T 高压1 |≤D, the current detected high-pressure temperature T 高压 , the compressor frequency f, and the exhaust temperature T 排气 are updated to the preset data table, and then return to step 3 and start from step 3; if |T 高压 -T 高压1 |>D, step 5 is performed.

[0071] Step 5, set the opening degree of the outdoor electronic expansion valve to the maximum, and record the high pressure temperature T at this time 高压2 , record the high pressure temperature T again after t2 time 高压3 , and then judge T 高压2 -T 高压3 > set value E; the set value E can be 5℃, and the t2 time can be set to 5min.

[0072] If T 高压2 -T 高压3 >E, it is considered that the temperature controller and the four-way valve signal line of the indoor unit are abnormal, and then the fault information of the temperature controller and the four-way valve signal line of the indoor unit is reported; if T 高压2 -T 高压3 ≤E, it is considered that the outdoor electronic expansion valve is blocked, and then the fault information of the outdoor electronic expansion valve is reported, and the air conditioning unit is controlled to stop.

[0073] The scheme of the present application determines that the system fault reason is that the temperature controller and the four-way valve signal of the indoor unit are abnormal or the outdoor electronic expansion valve is blocked by judging the influence of the opening degree of the outdoor electronic expansion valve on the high pressure temperature in the case that the air conditioner has determined that the refrigerant amount is suddenly reduced and the high pressure temperature is suddenly changed, and corresponding fault information is prompted and the air conditioning unit is stopped, so that the unit is prevented from running in an abnormal state for a long time, the reliability of the unit is ensured, the abnormal detection mechanism of the air conditioner is more comprehensive and intelligent, and the use experience of the user is improved.

[0074] At step S150, if it is determined that the second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal, the fault information of the second four-way valve signal line connected with the temperature controller and the indoor unit is reported.

[0075] The scheme of the present application continuously acquires the high pressure temperature, the compressor frequency and the exhaust temperature of the air conditioner when the air conditioning unit runs in the heating mode, determines whether the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced through the comparison result of the high pressure temperature, the compressor frequency and the exhaust temperature and the set difference value, and if the refrigerant amount is suddenly reduced, judges whether the four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the high pressure temperature and the preset standard high pressure temperature, and then quickly locates the reason for the sudden reduction of the refrigerant amount, avoids the air conditioner running in an abnormal state for a long time, affects the running efficiency, and ensures the reliability of the air conditioning unit.

[0076] The technical scheme of the present application, when the non-communication air conditioning unit is running in the heating mode, according to the obtained high-pressure temperature, exhaust temperature and compressor frequency, judges the size relationship between the high-pressure temperature fluctuation value, the exhaust temperature fluctuation value and the compressor frequency fluctuation value and the set deviation value within the first preset time, so as to determine whether the amount of refrigerant flowing through the air conditioning compressor is suddenly reduced; if it is determined that the amount of refrigerant is suddenly reduced, it is determined that the absolute value of the difference between the current high-pressure temperature and the preset standard high-pressure temperature is greater than the standard high-pressure temperature set difference, so as to determine whether the high-pressure temperature of the air conditioner is abnormally mutated; if it is determined that the high-pressure temperature is abnormally mutated, the opening of the outdoor electronic expansion valve is set to the maximum opening, and it is determined whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than the first high-pressure temperature set difference, so as to determine whether the system abnormality is caused by the abnormality of the four-way valve signal line connected to the indoor unit of the temperature controller or the blockage of the outdoor electronic expansion valve; after determining the abnormality, the fault information is reported, and the air conditioner is controlled to stop according to the fault. Therefore, when the air conditioning unit is abnormal, the fault cause can be quickly and accurately located, the fault information is prompted, and the air conditioning unit is controlled, which facilitates the user to maintain or control the air conditioning unit, avoids the air conditioning unit running in an abnormal state for a long time, improves the reliability of the air conditioning unit, makes the control of the air conditioning unit more intelligent, and improves the air conditioning experience.

[0077] According to the embodiments of the present application, an air conditioner abnormality detection and control device corresponding to the air conditioner abnormality detection and control method is also provided. The air conditioner is a non-communication air conditioning unit, which comprises a temperature controller, an indoor unit and an outdoor unit. The temperature controller has a first four-way valve signal line and a second four-way valve signal line. The temperature controller is connected to the terminal corresponding to the temperature controller on the mainboard of the outdoor unit through the first four-way valve signal line, and is connected to the terminal corresponding to the temperature controller on the mainboard of the indoor unit through the second four-way valve signal line. The outdoor unit has an outdoor electronic expansion valve and a four-way valve. The indoor unit has an indoor electronic expansion valve. The temperature controller sends a four-way valve control signal to the outdoor unit through the first four-way valve control line, and sends a four-way valve control signal to the indoor unit through the second four-way valve control line. The four-way valve control signals sent by the temperature controller to the indoor unit and the outdoor unit are consistent. For a non-communication temperature controller, if the unit is running in the heating mode, a 24V electrical signal is generally sent. For example, when heating, the temperature controller sends a 24V electrical signal to the indoor unit and the outdoor unit. When cooling, the temperature controller does not send the electrical signal, and the indoor unit and the outdoor unit receive a 0V signal. Therefore, if the unit does not receive the 24V electrical signal of the four-way valve, it is considered to be in the cooling mode. The outdoor unit controls the outdoor electronic expansion valve and the four-way valve according to the four-way valve control signal. The indoor unit controls the indoor electronic expansion valve according to the four-way valve control signal. Figure 5A structural schematic diagram of an embodiment of the device of the application is shown. The abnormality detection and control device of the air conditioner can include an acquisition unit 102 and a processing unit 104.

[0078] The processing unit 104 is configured to confirm that the air conditioner is running in the heating mode if the outdoor unit receives the four-way valve control signal sent by the temperature controller through the first four-way valve control line. The specific functions and processing of the processing unit 104 are described in step S110.

[0079] The acquisition unit 102 is configured to acquire the temperature of the high-pressure pipeline on the compressor discharge side of the air conditioner, denoted as the high-pressure temperature, specifically, the pressure on the high-pressure side detected by the high-pressure sensor, and the temperature corresponding to the high-pressure pressure; acquire the temperature at the compressor discharge port of the air conditioner, denoted as the discharge temperature, and there is a certain temperature attenuation between the discharge temperature and the high-pressure temperature, and the high-pressure temperature is lower than the discharge temperature; acquire the operating frequency of the compressor of the air conditioner, denoted as the compressor frequency; and wherein, if the outdoor unit receives the four-way valve control signal sent by the temperature controller, it is confirmed that the air conditioner is running in the heating mode. The specific functions and processing of the acquisition unit 102 are described in step S120.

[0080] The processing unit 104 is further configured to compare the high-pressure temperature, the discharge temperature, and the compressor frequency with the set deviation value respectively, and determine whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result. The specific functions and processing of the processing unit 104 are described in step S130.

[0081] The processing unit 104 is specifically further configured to pre-establish a preset data table including standard high-pressure temperature, discharge temperature, and compressor frequency, wherein the standard high-pressure temperature corresponds to the discharge temperature and the compressor frequency, and the corresponding standard high-pressure temperature can be determined according to the discharge temperature and the compressor frequency.

[0082] The processing unit 104 compares the high-pressure temperature, the discharge temperature, and the compressor frequency with the set deviation value respectively, and determines whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, including:

[0083] The processing unit 104 is further configured to determine whether the high-pressure temperature fluctuation value is greater than a high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to an exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency set deviation value. The specific functions and processes of the processing unit 104 are described with reference to step S220.

[0084] The processing unit 104 is further configured to determine whether the high-pressure temperature fluctuation value is greater than a high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to an exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency set deviation value. The specific functions and processes of the processing unit 104 are described with reference to step S220.

[0085] The processing unit 104 is further configured to determine whether the high-pressure temperature fluctuation value is greater than a high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to an exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency set deviation value. The specific functions and processes of the processing unit 104 are described with reference to step S220.

[0086] The processing unit 104 is further configured to determine whether the high-pressure temperature fluctuation value is greater than a high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to an exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency set deviation value. The specific functions and processes of the processing unit 104 are described with reference to step S220.

[0087] Specifically, after the air conditioning unit is installed, in the trial operation stage, the air conditioning unit establishes a data table of high-pressure temperature, compressor frequency, and exhaust temperature based on the parameters in the trial operation process. Through the data table, the corresponding compressor frequency and exhaust temperature can be found according to the high-pressure temperature, and the corresponding high-pressure temperature can also be found according to the compressor frequency and exhaust temperature. The high-pressure temperature in the data table is used as a standard high-pressure temperature, which is used to determine whether the high-pressure temperature of the air conditioner is suddenly abnormal in the subsequent process.

[0088] If the amount of refrigerant flowing through the compressor of the air conditioner suddenly decreases, the amount of high-temperature and high-pressure refrigerant discharged by the compressor decreases, causing the discharge temperature and the high-pressure temperature to suddenly increase. The most direct impact is on the high-pressure temperature, which can change greatly in a short time. Although the discharge temperature also increases, it does not change greatly in a short time. Therefore, the fluctuation value of the high-pressure temperature is greater than the set difference of the high-pressure temperature, and the fluctuation value of the discharge temperature is less than or equal to the set difference of the discharge temperature. The frequency adjustment period of the compressor is generally 1-2 minutes, and the first preset time is set to be relatively short. Therefore, the frequency of the compressor does not change greatly in a short time, that is, the fluctuation value of the frequency of the compressor is less than or equal to the set difference of the frequency of the compressor.

[0089] Figure 7 The flowchart of an embodiment of the four-way valve signal line abnormality detection and control method of the air conditioner of the present application is shown in FIG. 1. The four-way valve signal line abnormality detection and control method of the present application comprises the following steps. Figure 7

[0090] Step 1: During the trial operation stage after installation of the air conditioning unit, a data table of the high-pressure temperature T 高压 and the compressor frequency f, the discharge temperature T 排气 is established based on the parameters obtained during the trial operation. Then, step 2 is performed when the air conditioning unit is started.

[0091] Step 2: When the air conditioning unit is started, it is detected whether the four-way valve signal from the temperature controller is received by the outdoor unit, that is, it is confirmed whether the heating mode of the air conditioning unit is started. If not, that is, the heating mode of the air conditioning unit is not started, the air conditioning unit is controlled according to the normal adjustment logic. If yes, that is, the heating mode of the air conditioning unit is started, step 3 is performed.

[0092] Step 3: The high-pressure temperature T 高压 , the compressor frequency f, and the discharge temperature T 排气 of the air conditioning unit are continuously detected, and it is determined whether the following conditions are simultaneously satisfied: the fluctuation value of the high-pressure temperature T 高压 is greater than A, the fluctuation value of the discharge temperature T 排气 is less than or equal to B, and the fluctuation value of the compressor frequency f is less than or equal to C. A is the set deviation value of the high-pressure temperature, B is the set deviation value of the discharge temperature, and C is the set deviation value of the compressor frequency. The values of the high-pressure temperature T 高压 , the compressor frequency f, and the discharge temperature T 排气 are detected every t1 time, and the difference between the current detected value and the last detected value is taken as the fluctuation value.

[0093] If all the conditions are simultaneously satisfied, it is considered that the amount of refrigerant flowing through the compressor of the air conditioning unit suddenly decreases, and then step 4 is performed. Otherwise, the currently detected high-pressure temperature T 高压 , the compressor frequency f, and the discharge temperature T 排气 ​Update to the preset data table, and then re-execute step 3.

[0094] Wherein, the high-pressure temperature, the exhaust temperature and the frequency in the data table are corresponding, the current detected high-pressure temperature T 高压 Update to the high-pressure temperature position corresponding to the exhaust temperature and the compressor frequency in the data table. For example, the current detected exhaust temperature is 55 DEG C, the compressor frequency is 60 Hz, the high-pressure temperature is 60 DEG C, and the high-pressure temperature position corresponding to the exhaust temperature of 55 DEG C and the compressor frequency of 60 Hz in the data table is searched, the detected high-pressure temperature 60 DEG C is updated to this position, and if there is no data before this position, the data is added. By updating the data table in real time, the data in the data table is always the latest data in the current state, so that the subsequent judgment of whether the high-pressure temperature is suddenly changed is more accurate, the false judgment is avoided, and the accuracy of detecting whether the four-way valve signal line of the temperature controller and the indoor unit is abnormal is improved.

[0095] The scheme of the application can accurately distinguish whether the refrigerant amount in the system is suddenly reduced by judging the size relationship between the high-pressure temperature fluctuation value, the exhaust temperature fluctuation value, the compressor frequency fluctuation value and the corresponding set deviation value, and further determining the reason for the sudden reduction of the refrigerant amount. According to the high-pressure temperature and the high-pressure temperature in the preset data table, whether the four-way valve signal line of the temperature controller and the indoor unit is abnormal is identified, so that the cause of the system abnormality is quickly located, the system is prevented from being in an abnormal state for a long time, and the reliability of the system is improved.

[0096] The processing unit 104 is also configured to determine whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and the preset standard high-pressure temperature if it is determined that the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced. The specific functions and processing of the processing unit 104 are described in step S140.

[0097] In some embodiments, the processing unit 104 determines whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and the preset standard high-pressure temperature, including:

[0098] The processing unit 104 is also configured to obtain the corresponding standard high-pressure temperature from the preset data table according to the current exhaust temperature and the compressor frequency. The specific functions and processing of the processing unit 104 are described in step S310.

[0099] The processing unit 104 is also configured to determine whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than the standard high-pressure temperature set difference. The standard high-pressure temperature set difference can be set to 2 DEG C. The specific functions and processing of the processing unit 104 are described in step S320.

[0100] The processing unit 104 is further configured to determine that the high-pressure temperature of the air conditioner is abnormal if the high-pressure temperature is greater than the standard high-pressure temperature, and then determine whether the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the high-pressure temperature. For details of the specific functions and processing of the processing unit 104, see step S330.

[0101] The processing unit 104 is further configured to update the current discharge temperature and the compressor frequency corresponding to the high-pressure temperature to a preset data table if the high-pressure temperature is less than or equal to the standard high-pressure temperature, and then reacquire the high-pressure temperature, the discharge temperature, and the compressor frequency to continue determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced. For details of the specific functions and processing of the processing unit 104, see step S340.

[0102] Since it has been determined that there is a large change in the high-pressure temperature by judging the size relationship between the high-pressure temperature fluctuation value and the high-pressure temperature set deviation value, if the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than the standard high-pressure temperature set deviation value, it indicates that the high-pressure temperature has a significant mutation, and the abnormality of the system has a large impact on the operation of the air conditioner. At this time, it is necessary to further confirm the reason for the occurrence of such an abnormal situation, that is, to determine whether the four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the high-pressure temperature, so as to locate the fault of the air conditioner and facilitate subsequent control or maintenance of the air conditioner.

[0103] In some embodiments, the processing unit 104 determines whether the four-way valve signal line connected between the temperature controller and the indoor unit is abnormal according to the high-pressure temperature, including:

[0104] The processing unit 104 is further configured to set the opening degree of the outdoor electronic expansion valve to the maximum opening degree, and then acquire the current high-pressure temperature, denoted as a first high-pressure temperature. After a second preset time, the current high-pressure temperature is acquired again, denoted as a second high-pressure temperature. The second preset time can be set to 5 minutes. For details of the specific functions and processing of the processing unit 104, see step S410.

[0105] The processing unit 104 is further configured to determine whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than a first high-pressure temperature set deviation value. The first high-pressure temperature set deviation value can be set to 5°C. For details of the specific functions and processing of the processing unit 104, see step S420.

[0106] The processing unit 104 is further configured to determine that the four-way valve signal line connected between the temperature controller and the indoor unit is abnormal if the first high-pressure temperature is greater than the second high-pressure temperature. For details of the specific functions and processing of the processing unit 104, see step S430.

[0107] The processing unit 104 is further configured to determine that the outdoor electronic expansion valve is blocked if the first high pressure temperature is less than or equal to the second high pressure temperature, report fault information that the outdoor electronic expansion valve is blocked, and control the air conditioner to stop. The specific functions and processing of the processing unit 104 are described in step S440.

[0108] Specifically, if the reason for the sudden change of the high pressure temperature is that the signal line of the four-way valve connected to the indoor unit is abnormal, that is, the indoor unit does not receive the control signal of the four-way valve, at this time, the indoor electronic expansion valve is still controlled by the indoor unit according to the refrigeration mode, and the outdoor electronic expansion valve is controlled by the outdoor unit according to the heating mode, so that the indoor electronic expansion valve and the outdoor electronic expansion valve are throttled at the same time under the current state, resulting in a sudden decrease in the system refrigerant amount. At this time, if the opening degree of the outdoor electronic expansion valve is set to the maximum, only the indoor electronic expansion valve is throttled thereafter, which is equivalent to reducing the throttling degree and increasing the refrigerant amount in the system circulation, so that the refrigerant amount flowing into the air conditioner compressor increases. Since the refrigerant amount changes most in the high pressure temperature, the high pressure temperature is reduced by increasing the refrigerant amount, so that after the second preset time, the high pressure temperature has changed obviously, and at this time, the difference between the first high pressure temperature and the second high pressure temperature is greater than the first high pressure temperature set difference. If the difference between the first high pressure temperature and the second high pressure temperature is less than or equal to the first high pressure temperature set difference, it indicates that setting the opening degree of the outdoor electronic expansion valve to the maximum does not reduce the system throttling degree, and the refrigerant amount flowing into the air conditioner compressor does not increase, so at this time, it is considered that the outdoor electronic expansion valve is blocked, and the opening degree of the outdoor electronic expansion valve cannot be adjusted due to the blockage.

[0109] Figure 7 The flowchart of an embodiment of the four-way valve signal line abnormality detection and control method of the air conditioner of the present application is shown in Figure 7 The four-way valve signal line abnormality detection and control method of the present application further comprises:

[0110] Step 4: Obtain the high pressure temperature T corresponding to the current discharge temperature and the compressor frequency from the data table. 高压1 Determine whether |T 高压 -T 高压1 |>D, and the set value D can be 2℃. If |T 高压 -T 高压1 |≤D, update the current detected high pressure temperature T 高压 , the compressor frequency f, and the discharge temperature T 排气 to the preset data table, and then return to step 3 and execute from step 3; if |T 高压 -T 高压1 |>D, execute step 5.

[0111] Step 5, set the opening degree of the outdoor electronic expansion valve to the maximum, and record the high pressure temperature T at this time 高压2 , record the high pressure temperature T again after t2 time 高压3 , and then determine whether T 高压2 -T 高压3 > set value E; the set value E can be 5℃, and the t2 time can be set to 5min.

[0112] If T 高压2 -T 高压3 >E, it is considered that the temperature controller and the four-way valve signal line of the indoor unit are abnormal, and then the fault information of the temperature controller and the four-way valve signal line of the indoor unit is reported; if T 高压2 -T 高压3 ≤E, it is considered that the outdoor electronic expansion valve is blocked, and then the fault information of the outdoor electronic expansion valve is reported, and the air conditioning unit is controlled to stop.

[0113] The scheme of the present application determines that the system fault reason is that the temperature controller and the four-way valve signal of the indoor unit are abnormal or the outdoor electronic expansion valve is blocked by judging the influence of the opening degree of the outdoor electronic expansion valve on the high pressure temperature in the case that the air conditioner has the abnormality of sudden reduction of refrigerant amount and sudden change of high pressure temperature, and corresponding fault information is prompted and the air conditioning unit is stopped, so that the unit is prevented from running in an abnormal state for a long time, the reliability of the unit is ensured, the abnormal detection mechanism of the air conditioner is more comprehensive and intelligent, and the use experience of the user is improved.

[0114] The processing unit 104 is also configured to report the fault information of the second four-way valve signal line connected between the temperature controller and the indoor unit if it is determined that the second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal. The specific functions and processing of the processing unit 104 are described in step S150.

[0115] In the scheme of the present application, the high pressure temperature, the compressor frequency and the discharge temperature of the air conditioner are continuously acquired when the air conditioning unit is running in the heating mode, the comparison result of the high pressure temperature, the compressor frequency and the discharge temperature with the set difference value is used to determine whether the refrigerant amount flowing through the compressor of the air conditioner is suddenly reduced, if the refrigerant amount is suddenly reduced, whether the four-way valve signal line connected between the temperature controller and the indoor unit is abnormal is determined according to the high pressure temperature and the preset standard high pressure temperature, and then the reason for the sudden reduction of the refrigerant amount is quickly located, the air conditioner is prevented from running in an abnormal state for a long time, the running efficiency is affected, and the reliability of the air conditioning unit is ensured.

[0116] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0117] The technical scheme of the present application, when the non-communication air conditioning unit is running in the heating mode, according to the obtained high-pressure temperature, exhaust temperature and compressor frequency, judges the size relationship between the high-pressure temperature fluctuation value, the exhaust temperature fluctuation value and the compressor frequency fluctuation value and the set deviation value within the first preset time, so as to determine whether the amount of refrigerant flowing through the air conditioning compressor is suddenly reduced; if it is determined that the amount of refrigerant is suddenly reduced, it is determined that the absolute value of the difference between the current high-pressure temperature and the preset standard high-pressure temperature is greater than the standard high-pressure temperature set difference, so as to determine whether the high-pressure temperature of the air conditioner is suddenly abnormal; if it is determined that the high-pressure temperature is suddenly abnormal, the opening of the outdoor electronic expansion valve is set to the maximum opening, and it is determined whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than the first high-pressure temperature set difference, so as to determine whether the system abnormality is caused by the abnormality of the four-way valve signal line connected to the indoor unit of the temperature controller or the blockage of the outdoor electronic expansion valve; after determining the abnormality, the fault information is reported, and the air conditioner is controlled to stop according to the fault. Therefore, when the air conditioning unit appears abnormal, the fault cause can be quickly and accurately located, and the fault information prompt and the air conditioning unit control are performed, which facilitates the user to maintain or control the air conditioning unit, avoids the air conditioning unit running in an abnormal state for a long time, improves the reliability of the air conditioning unit, makes the control of the air conditioning unit more intelligent, and improves the air conditioning experience.

[0118] According to the embodiments of the present application, an air conditioner corresponding to the abnormality detection and control device of the air conditioner is also provided. The air conditioner can include the above-mentioned abnormality detection and control device of the air conditioner.

[0119] Since the processing and functions realized by the air conditioner of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, the description of the present embodiment does not elaborate on the related descriptions in the foregoing embodiments, which will not be repeated here.

[0120] According to the technical scheme, when the communication-free air conditioning unit operates in the heating mode, the high-pressure temperature, the exhaust temperature and the compressor frequency obtained are used to determine the size relationship between the high-pressure temperature fluctuation value, the exhaust temperature fluctuation value and the compressor frequency fluctuation value and the set deviation value within the first preset time, so as to determine whether the amount of refrigerant flowing through the air conditioning compressor is suddenly reduced; if it is determined that the amount of refrigerant is suddenly reduced, it is determined that the absolute value of the difference between the current high-pressure temperature and the preset standard high-pressure temperature is greater than the set difference value of the standard high-pressure temperature, so as to determine whether the high-pressure temperature of the air conditioner is abnormally mutated; if it is determined that the high-pressure temperature is abnormally mutated, the opening degree of the outdoor electronic expansion valve is set to the maximum opening degree, and it is determined whether the difference between the first high-pressure temperature and the second high-pressure temperature is greater than the set difference value of the first high-pressure temperature, so as to determine whether the abnormal reason is that the four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or that the outdoor electronic expansion valve is blocked; after the abnormal reason is determined, the fault information is reported, and the air conditioner is controlled to stop according to the fault. Therefore, when the air conditioning unit is abnormal, the fault reason can be quickly and accurately located, the fault information is prompted, the air conditioning unit is controlled, the user is facilitated to maintain or control the air conditioning unit, the air conditioning unit is prevented from operating in an abnormal state for a long time, the reliability of the air conditioning unit is improved, the control of the air conditioning unit is more intelligent, and the air conditioning experience is improved.

[0121] According to the embodiment of the application, a storage medium corresponding to the air conditioner abnormality detection and control method is also provided, the storage medium comprises a stored program, wherein when the program is executed, the device where the storage medium is located performs the air conditioner abnormality detection and control method described above.

[0122] Since the processing and functions realized by the storage medium of the embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the embodiment is not described in detail, and the related description in the foregoing embodiments can be referred to, which is not described herein.

[0123] The technical scheme of the present application, when the air conditioner unit without communication operates in the heating mode, according to the obtained high pressure temperature, exhaust temperature, and compressor frequency, determines the size relationship between the high pressure temperature fluctuation value, the exhaust temperature fluctuation value, and the compressor frequency fluctuation value within the first preset time and the set deviation value, to determine whether the amount of refrigerant flowing through the air conditioner compressor is suddenly reduced; if it is determined that the amount of refrigerant is suddenly reduced, it is determined that the absolute value of the difference between the current high pressure temperature and the preset standard high pressure temperature is greater than the standard high pressure temperature set difference, to determine whether the high pressure temperature of the air conditioner is suddenly abnormal; if it is determined that the high pressure temperature is suddenly abnormal, the opening of the outdoor electronic expansion valve is set to the maximum opening, and it is determined whether the difference between the first high pressure temperature and the second high pressure temperature is greater than the first high pressure temperature set difference, to determine whether the system abnormality is caused by the abnormality of the four-way valve signal line connected to the indoor unit of the temperature controller, or by the blockage of the outdoor electronic expansion valve; after determining the abnormality, the fault information is reported, and the air conditioner is controlled to stop according to the fault. Therefore, when the air conditioner unit is abnormal, the fault cause can be quickly and accurately located, and the fault information can be prompted and the air conditioner unit can be controlled, which facilitates the user to maintain or control the air conditioner unit, avoids the air conditioner unit running in an abnormal state for a long time, improves the reliability of the air conditioner unit, makes the control of the air conditioner unit more intelligent, and improves the air conditioner use experience.

[0124] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and stacked without conflict.

[0125] The above only describes the embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A method for detecting and controlling anomalies in an air conditioner, characterized in that, The air conditioner includes a thermostat, an indoor unit, and an outdoor unit. The thermostat has a first four-way valve signal line and a second four-way valve signal line. The thermostat is connected to the outdoor unit via the first four-way valve signal line, and to the indoor unit via the second four-way valve signal line. The outdoor unit has an outdoor unit electronic expansion valve and a four-way valve. The indoor unit has an indoor unit electronic expansion valve. The thermostat sends a four-way valve control signal to the outdoor unit via the first four-way valve signal line, and sends a four-way valve control signal to the indoor unit via the second four-way valve signal line. The method includes: If the outdoor unit receives a four-way valve control signal sent by the thermostat through the first four-way valve signal line, it confirms that the air conditioner is operating in heating mode. If the air conditioner is confirmed to be operating in heating mode, the temperature of the high-pressure pipeline on the exhaust side of the air conditioner compressor is obtained and recorded as the high-pressure temperature; the temperature at the exhaust port of the air conditioner compressor is obtained and recorded as the exhaust temperature; the operating frequency of the air conditioner compressor is obtained and recorded as the compressor frequency. The high-pressure temperature, the exhaust temperature, and the compressor frequency are compared with the set deviation values, and the refrigerant charge flowing through the air conditioner compressor is determined based on the comparison results to see if the refrigerant charge has decreased sharply. If it is determined that the refrigerant charge flowing through the compressor of the air conditioner has suddenly decreased, then based on the current high pressure temperature and the preset standard high pressure temperature, determine whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal; If it is determined that the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal, then report the fault information that the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal.

2. The method for detecting and controlling air conditioner malfunctions according to claim 1, characterized in that, A preset data table is established in advance, including standard high-pressure temperature, exhaust temperature, and compressor frequency. The standard high-pressure temperature corresponds to the exhaust temperature and compressor frequency. The corresponding standard high-pressure temperature can be determined based on the exhaust temperature and compressor frequency. The high-pressure temperature, the exhaust temperature, and the compressor frequency are compared with set deviation values, and the refrigerant charge flowing through the air conditioner compressor is determined based on the comparison results to determine whether there has been a sudden decrease, including: The difference between the current high-pressure temperature and the high-pressure temperature obtained before the first preset time is recorded as the high-pressure temperature fluctuation value; the difference between the current exhaust temperature and the exhaust temperature obtained before the first preset time is recorded as the exhaust temperature fluctuation value; the difference between the current compressor frequency and the compressor frequency obtained before the first preset time is recorded as the compressor frequency fluctuation value. Determine whether the following conditions are met: the high-pressure temperature fluctuation value is greater than the high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to the exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to the compressor frequency set deviation value. If this condition is met, it is determined that the amount of refrigerant flowing through the compressor of the air conditioner has decreased sharply; If the conditions are not met, the exhaust temperature and compressor frequency corresponding to the current high-pressure temperature are updated to the preset data table; then the high-pressure temperature, exhaust temperature, and compressor frequency are re-acquired to continue determining whether the refrigerant charge flowing through the compressor of the air conditioner has decreased sharply.

3. The method for detecting and controlling an air conditioner malfunction according to claim 1 or 2, characterized in that, Based on the current high-pressure temperature and the preset standard high-pressure temperature, determine whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal, including: Based on the current exhaust temperature and the compressor frequency, obtain the corresponding standard high-pressure temperature from a preset data table; Determine whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than the set difference of the standard high-pressure temperature; If the temperature is greater than the specified value, it is determined that the high-pressure temperature of the air conditioner is abnormal. Then, based on the high-pressure temperature, it is determined whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal. If the value is less than or equal to the current high-pressure temperature, the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature are updated to the preset data table; then the high-pressure temperature, exhaust temperature, and compressor frequency are re-acquired to continue determining whether the refrigerant charge flowing through the compressor of the air conditioner has decreased sharply.

4. The method for detecting and controlling air conditioner malfunctions according to claim 3, characterized in that, Determining whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal based on the high-pressure temperature includes: Set the opening of the outdoor unit's electronic expansion valve to the maximum opening, then obtain the current high-pressure temperature and record it as the first high-pressure temperature; after a second preset time, obtain the current high-pressure temperature again and record it as the second high-pressure temperature. Determine whether the difference between the current first high-pressure temperature and the second high-pressure temperature is greater than the set difference of the first high-pressure temperature; If the value is greater than 1, it indicates that the signal line of the second four-way valve connecting the thermostat and the indoor unit is malfunctioning. If the value is less than or equal to the value, it is determined that the outdoor unit's electronic expansion valve is blocked, the fault information of the blockage of the outdoor unit's electronic expansion valve is reported, and the air conditioner is controlled to stop.

5. An air conditioner anomaly detection and control device, characterized in that, The air conditioner includes: a thermostat, an indoor unit, and an outdoor unit. The thermostat has a first four-way valve signal line and a second four-way valve signal line. The thermostat is connected to the outdoor unit via the first four-way valve signal line, and to the indoor unit via the second four-way valve signal line. The outdoor unit has an outdoor unit electronic expansion valve and a four-way valve. The indoor unit has an indoor unit electronic expansion valve. The thermostat sends a four-way valve control signal to the outdoor unit via the first four-way valve signal line, and sends a four-way valve control signal to the indoor unit via the second four-way valve signal line. The device includes: The processing unit is configured to confirm that the air conditioner is operating in heating mode if the outdoor unit receives a four-way valve control signal sent by the thermostat through the first four-way valve signal line. The acquisition unit is configured to, when confirming that the air conditioner is operating in heating mode, acquire the temperature of the high-pressure pipeline on the exhaust side of the air conditioner compressor, and record it as the high-pressure temperature; acquire the temperature at the exhaust port of the air conditioner compressor, and record it as the exhaust temperature; and acquire the operating frequency of the air conditioner compressor, and record it as the compressor frequency. The processing unit is further configured to compare the high-pressure temperature, the exhaust temperature, and the compressor frequency with a set deviation value, and determine whether the refrigerant charge flowing through the compressor of the air conditioner has decreased sharply based on the comparison result. The processing unit is further configured to, if it is determined that the refrigerant charge flowing through the compressor of the air conditioner has suddenly decreased, determine whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal, based on the current high-pressure temperature and the preset standard high-pressure temperature. The processing unit is further configured to report a fault message indicating that the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal if it is determined that the signal line is abnormal.

6. The air conditioner anomaly detection and control device according to claim 5, characterized in that, The processing unit is further configured to pre-establish a preset data table including standard high-pressure temperature, exhaust temperature, and compressor frequency, wherein the standard high-pressure temperature corresponds to the exhaust temperature and compressor frequency, and the corresponding standard high-pressure temperature can be determined based on the exhaust temperature and compressor frequency. The processing unit compares the high-pressure temperature, the exhaust temperature, and the compressor frequency with set deviation values, and determines whether the refrigerant charge flowing through the air conditioner's compressor has suddenly decreased based on the comparison results, including: The difference between the current high-pressure temperature and the high-pressure temperature obtained before the first preset time is recorded as the high-pressure temperature fluctuation value; the difference between the current exhaust temperature and the exhaust temperature obtained before the first preset time is recorded as the exhaust temperature fluctuation value; the difference between the current compressor frequency and the compressor frequency obtained before the first preset time is recorded as the compressor frequency fluctuation value. Determine whether the following conditions are met: the high-pressure temperature fluctuation value is greater than the high-pressure temperature set deviation value, the exhaust temperature fluctuation value is less than or equal to the exhaust temperature set deviation value, and the compressor frequency fluctuation value is less than or equal to the compressor frequency set deviation value. If this condition is met, it is determined that the amount of refrigerant flowing through the compressor of the air conditioner has decreased sharply; If the conditions are not met, the exhaust temperature and compressor frequency corresponding to the current high-pressure temperature are updated to the preset data table; then the high-pressure temperature, exhaust temperature, and compressor frequency are re-acquired to continue determining whether the refrigerant charge flowing through the compressor of the air conditioner has decreased sharply.

7. The air conditioner anomaly detection and control device according to claim 5, characterized in that, The processing unit determines, based on the current high-pressure temperature and the preset standard high-pressure temperature, whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal, including: Based on the current exhaust temperature and the compressor frequency, obtain the corresponding standard high-pressure temperature from a preset data table; Determine whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is greater than the set difference of the standard high-pressure temperature; If the temperature is greater than the specified value, it is determined that the high-pressure temperature of the air conditioner is abnormal. Then, based on the high-pressure temperature, it is determined whether the signal line of the second four-way valve connecting the thermostat and the indoor unit is abnormal. If the value is less than or equal to the current high-pressure temperature, the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature are updated to the preset data table; then the high-pressure temperature, exhaust temperature, and compressor frequency are re-acquired to continue determining whether the refrigerant charge flowing through the compressor of the air conditioner has decreased sharply.

8. The air conditioner anomaly detection and control device according to claim 7, characterized in that, The processing unit determines whether the four-way valve signal line connecting the thermostat and the indoor unit is abnormal based on the high-pressure temperature, including: Set the opening of the outdoor unit's electronic expansion valve to the maximum opening, then obtain the current high-pressure temperature and record it as the first high-pressure temperature; after a second preset time, obtain the current high-pressure temperature again and record it as the second high-pressure temperature. Determine whether the difference between the current first high-pressure temperature and the second high-pressure temperature is greater than the set difference of the first high-pressure temperature; If the value is greater than 1, it indicates that there is an abnormality in the four-way valve signal line connecting the thermostat and the indoor unit. If the value is less than or equal to the value, it is determined that the outdoor unit's electronic expansion valve is blocked, the fault information of the blockage of the outdoor unit's electronic expansion valve is reported, and the air conditioner is controlled to stop.

9. An air conditioner, characterized in that, include: An abnormality detection and control device for an air conditioner as described in any one of claims 5 to 8.

10. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the abnormal detection and control method for the air conditioner as described in any one of claims 1 to 4.

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