CN117091264A

CN117091264A - Abnormality detection and control method and device for air conditioner, air conditioner and storage medium

Info

Publication number: CN117091264A
Application number: CN202311076886.3A
Authority: CN
Inventors: 李思佳; 李天阳
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2023-11-21

Abstract

The invention discloses an abnormality detection and control method and device of an air conditioner, the air conditioner and a storage medium, wherein the air conditioner comprises a temperature controller, an indoor unit and an outdoor unit, and the temperature controller is respectively connected with the outdoor unit and the indoor unit through four-way valve signal wires; the method comprises the following steps: if the air conditioner is operated in the heating mode, determining whether the amount of refrigerant 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 with the set deviation values respectively; if the refrigerant quantity is determined to be suddenly reduced, determining whether a four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not according to the current high-pressure temperature and the preset standard high-pressure temperature, and if so, carrying out abnormality reminding. According to the scheme, if the quantity of the refrigerant flowing through the compressor is suddenly reduced, whether the four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not is judged according to the high-pressure temperature and the standard high-pressure temperature, and if the four-way valve signal line is abnormal, reminding is carried out, so that the air conditioner is prevented from running in an abnormal state, and the reliability of the air conditioner is ensured.

Description

Abnormality detection and control method and device for air conditioner, air conditioner and storage medium

Technical Field

The invention 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, in particular to a four-way valve signal line abnormality detection and control method and device of a communication-free air conditioner unit, the air conditioner and the storage medium.

Background

With technological progress and improvement of life quality, heat pump systems are becoming popular in general households. In the existing common heat pump units, each set of heat pump system is often controlled through a temperature controller, an outdoor unit and an indoor unit which are fixedly matched. For the communication-free air conditioning unit, the temperature controller, the internal machine and the external machine are controlled independently and controlled only by the switch signals, so that the air conditioning unit has the advantages of convenience in installation, independent modules, flexible collocation and the like, is popular in the air conditioning market, and occupies a larger market.

The inner machine and the outer machine of the communication-free air conditioning unit act based on signals sent by the temperature controllers, wherein the four-way valve control signals are required to be sent to the inner machine and the outer machine. However, if the four-way valve signal line of the temperature controller and the internal machine is disconnected or other anomalies occur, the internal machine cannot receive the four-way valve control signal, but the external machine cannot identify whether the internal machine receives the four-way valve control signal, so that the control of the unit is possibly abnormal. For how to reasonably judge whether the temperature controller line is abnormal under the condition of no communication with the temperature controller, and timely reminding a user of avoiding abnormal operation of the unit is still a problem to be solved.

The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.

Disclosure of Invention

The invention aims to provide an abnormality detection and control method and device for an air conditioner, the air conditioner and a storage medium, so as to solve the problem that in the prior art, if a temperature controller of a communication air conditioner unit is disconnected from a four-way valve signal line of an inner machine or other abnormalities occur, the inner machine cannot receive a four-way valve control signal, but an outer machine cannot identify whether the inner machine receives the four-way valve control signal, so that the control of the machine set is abnormal, and the effects that if the condition that the quantity of refrigerant flowing through an air conditioner compressor is suddenly reduced under a heating mode of the air conditioner is judged, whether the four-way valve signal line connected with the temperature controller and the inner machine is abnormal is determined according to high-pressure temperature and preset standard high-pressure temperature, and if the temperature controller is abnormal, abnormality reminding is performed are achieved, so that the air conditioner is prevented from running in an abnormal state for a long time, and the reliability of the operation of the air conditioner is improved.

The invention provides an abnormality detection and control method of an air conditioner, which comprises the following steps: the indoor unit comprises a temperature controller, an indoor unit and an outdoor unit, wherein the temperature controller is provided with a first four-way valve signal line and a second four-way valve signal line; the temperature controller is connected to the outdoor unit through the first four-way valve signal line, and is connected to the indoor unit through the second four-way valve signal line; the outdoor unit is provided with an external motor expansion valve and a four-way valve; the indoor unit is provided with an internal machine 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 method comprises the following steps: if the outdoor unit receives a four-way valve control signal sent by the temperature controller through the first four-way valve control line, confirming that the air conditioner is operated in a heating mode; when the air conditioner is confirmed to operate in a heating mode, acquiring the temperature of a high-pressure pipeline at the exhaust side of a compressor of the air conditioner, and recording the temperature as a high-pressure temperature; acquiring the temperature at an exhaust port of a compressor of the air conditioner, and recording the temperature as an exhaust temperature; acquiring the running frequency of a compressor of the air conditioner and recording the running frequency as the compressor frequency; comparing the high-pressure temperature, the exhaust temperature and the compressor frequency with set deviation values respectively, and determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result; if the refrigerant quantity flowing through the compressor of the air conditioner is determined to be suddenly reduced, determining whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not according to the current high-pressure temperature and the preset standard high-pressure temperature; if the second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal, reporting fault information of the abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit.

In some embodiments, a preset data table including a standard high pressure temperature, a discharge temperature, and a compressor frequency is pre-established, wherein the standard high pressure temperature corresponds to the discharge temperature, the compressor frequency, and the corresponding standard high pressure temperature can be determined according to the discharge temperature and the compressor frequency; comparing the high pressure temperature, the exhaust temperature and the compressor frequency with set deviation values respectively, and determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, wherein the method comprises the following steps of: recording the difference value of the current high-pressure temperature and the high-pressure temperature acquired before the first preset time as the high-pressure temperature fluctuation value; recording the difference between the current exhaust temperature and the exhaust temperature acquired before the first preset time as the exhaust temperature fluctuation value; recording the difference value of the current compressor frequency and the compressor frequency acquired 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 setting deviation value, and the exhaust gas temperature fluctuation value is less than or equal to an exhaust gas temperature setting deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency setting deviation value; if so, determining that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced; if not, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into a preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

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 current high-pressure temperature and a preset standard high-pressure temperature includes: acquiring the corresponding standard high-pressure temperature from a preset data table according to the current exhaust temperature and the current compressor frequency; determining whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is larger than a set difference of the standard high-pressure temperature; if the temperature difference is larger than the preset value, determining that the high-pressure temperature of the air conditioner is abnormal, and then determining whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the high-pressure temperature; if the temperature is smaller than or equal to the preset data table, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into the preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

In some embodiments, determining whether a second four-way valve signal line connected to the thermostat and the indoor unit is abnormal according to the high-pressure temperature includes: setting the opening of the external electronic expansion valve to be the maximum opening, and then acquiring the current high-pressure temperature, and recording the current high-pressure temperature as a first high-pressure temperature; after a second preset time, acquiring the current high-pressure temperature again, and recording the current high-pressure temperature as a second high-pressure temperature; determining whether a difference between the current first high-pressure temperature and the second high-pressure temperature is larger than a first high-pressure temperature set difference; if the temperature difference is larger than the preset value, determining that a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal; if the temperature of the air conditioner is less than or equal to the preset temperature, determining that the outer electronic expansion valve is blocked, reporting fault information of the blocking of the outer electronic expansion valve, and controlling the air conditioner to stop.

In accordance with the foregoing method, another aspect of the present invention provides an abnormality detection and control apparatus for an air conditioner, the air conditioner including: the indoor unit comprises a temperature controller, an indoor unit and an outdoor unit, wherein the temperature controller is provided with a first four-way valve signal line and a second four-way valve signal line; the temperature controller is connected to the outdoor unit through the first four-way valve signal line, and is connected to the indoor unit through the second four-way valve signal line; the outdoor unit is provided with an external motor expansion valve and a four-way valve; the indoor unit is provided with an internal machine 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 device comprises: the processing unit is configured to confirm that the air conditioner is operated in a heating mode if the outdoor unit receives a four-way valve control signal sent by the temperature controller through the first four-way valve control line; an acquisition unit configured to acquire a temperature of a high-pressure pipeline on an exhaust side of a compressor of the air conditioner, and record the temperature as a high-pressure temperature, if the air conditioner is operated in a heating mode; acquiring the temperature at an exhaust port of a compressor of the air conditioner, and recording the temperature as an exhaust temperature; acquiring the running frequency of a compressor of the air conditioner and recording the running frequency as the compressor frequency; the processing unit is further configured to compare the high-pressure temperature, the exhaust temperature and the compressor frequency with set deviation values 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 processing unit is further configured to determine whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and a preset standard high-pressure temperature if it is determined that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced; and the processing unit is further configured to report fault information of abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit if the abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit is determined.

In some embodiments, the processing unit is specifically further configured to pre-establish a preset data table including a standard high pressure temperature, an exhaust gas temperature, and a compressor frequency, where the standard high pressure temperature corresponds to the exhaust gas temperature and the compressor frequency, and the corresponding standard high pressure temperature can be determined according to the exhaust gas temperature and the compressor frequency; the processing unit compares the high pressure temperature, the exhaust temperature and the compressor frequency with set deviation values respectively, determines whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, and comprises the following steps: recording the difference value of the current high-pressure temperature and the high-pressure temperature acquired before the first preset time as the high-pressure temperature fluctuation value; recording the difference between the current exhaust temperature and the exhaust temperature acquired before the first preset time as the exhaust temperature fluctuation value; recording the difference value of the current compressor frequency and the compressor frequency acquired 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 setting deviation value, and the exhaust gas temperature fluctuation value is less than or equal to an exhaust gas temperature setting deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency setting deviation value; if so, determining that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced; if not, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into a preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

In some embodiments, the processing unit determines, according to the current high-pressure temperature and a preset standard high-pressure temperature, whether a second four-way valve signal line connected between the temperature controller and the indoor unit is abnormal, including: acquiring the corresponding standard high-pressure temperature from a preset data table according to the current exhaust temperature and the current compressor frequency; determining whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is larger than a set difference of the standard high-pressure temperature; if the temperature difference is larger than the preset value, determining that the high-pressure temperature of the air conditioner is abnormal, and then determining whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the high-pressure temperature; if the temperature is smaller than or equal to the preset data table, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into the preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

In some embodiments, the processing unit determines, according to the high-pressure temperature, whether a four-way valve signal line connected to the thermostat and the indoor unit is abnormal, including: setting the opening of the external electronic expansion valve to be the maximum opening, and then acquiring the current high-pressure temperature, and recording the current high-pressure temperature as a first high-pressure temperature; after a second preset time, acquiring the current high-pressure temperature again, and recording the current high-pressure temperature as a second high-pressure temperature; determining whether a difference between the current first high-pressure temperature and the second high-pressure temperature is larger than a first high-pressure temperature set difference; if the temperature is higher than the preset value, determining that a four-way valve signal line connected with the temperature controller and the indoor unit is abnormal; if the temperature of the air conditioner is less than or equal to the preset temperature, determining that the outer electronic expansion valve is blocked, reporting fault information of the blocking of the outer electronic expansion valve, and controlling the air conditioner to stop.

In accordance with another aspect of the present invention, there is provided an air conditioner including: the abnormality detection and control device of the air conditioner described above.

In accordance with the foregoing method, a further aspect of the present invention provides a storage medium, where the storage medium includes a stored program, and when the program runs, controls a device where the storage medium is located to execute the foregoing method for detecting and controlling an abnormality of an air conditioner.

Therefore, according to the scheme, when the communication-free air conditioning unit operates in a heating mode, the temperature of a high-pressure pipeline at the exhaust side of the compressor is obtained and recorded as high-pressure temperature; acquiring the temperature at the exhaust port of the compressor, and recording the temperature as the exhaust temperature; acquiring the running frequency of a compressor, and recording the running frequency as the compressor frequency; determining whether the amount of refrigerant flowing through the air conditioner compressor is suddenly reduced according to the high-pressure temperature, the exhaust temperature and the comparison result of the compressor frequency and the set difference value; if the refrigerant quantity is determined to be suddenly reduced, further determining whether a four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not according to the current high-pressure temperature and the preset standard high-pressure temperature, and if so, carrying out fault reminding. Comparing the high-pressure temperature of the air conditioner running in a heating mode with a set difference value to judge whether a four-way valve signal line of the temperature controller is abnormal or not; and then determining whether the four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not according to the high-pressure temperature and the standard high-pressure temperature, and carrying out fault reminding if the four-way valve signal line is abnormal, so that the disconnection or the abnormality of the signal line of the temperature controller is timely identified, the abnormality of a unit is avoided, and the reliability of the air conditioner is ensured.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

FIG. 1 is a flow chart of an embodiment of an abnormality detection and control method of an air conditioner according to the present invention;

FIG. 2 is a flow chart of an embodiment of the method of determining whether the amount of refrigerant flowing through the air conditioner compressor is suddenly reduced according to the high pressure temperature, the discharge temperature and the compressor frequency;

FIG. 3 is a flow chart of an embodiment of determining whether the high pressure temperature is abnormal according to the high pressure temperature and a preset standard high pressure temperature in the method of the present invention;

FIG. 4 is a schematic flow chart of an embodiment of determining whether a four-way valve signal line connected between a thermostat and an indoor unit is abnormal according to a high-pressure temperature in the method of the present invention;

FIG. 5 is a schematic diagram illustrating an embodiment of an abnormality detection and control apparatus for an air conditioner according to the present invention;

FIG. 6 is a schematic diagram of an air conditioning system according to an embodiment of the air conditioner of the present invention;

FIG. 7 is a flow chart of a method for detecting and controlling anomalies in a four-way valve signal line of an air conditioner according to an embodiment of the present invention;

In the embodiment of the present invention, reference numerals are as follows, in combination with the accompanying drawings:

1-a high-pressure sensor; 2-a gas-liquid separator; 3-an outdoor side heat exchanger; 4-temperature controller; 5-an indoor side heat exchanger; 6-an exhaust gas temperature sensor; 7-a compressor; 8-an internal electronic expansion valve; 9-an external electronic expansion valve; 10-four-way reversing valve; 11-an inhalation temperature sensor; 12-a first four-way valve signal line; 13-a second four-way valve signal line; 102-an acquisition unit; 104-a processing unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 6 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention, and as shown in fig. 6, the air conditioning system is a communication-free air conditioning unit, and includes a temperature controller 4, an external unit and an internal unit. The external machine consists of a high-pressure temperature sensor 1, a vapor-liquid separator 2, an outdoor side heat exchanger 3, an exhaust temperature sensor 6, a compressor 7, an external machine electronic expansion valve 9, a four-way reversing valve 10 and an air suction temperature sensor 11; the inner machine consists of an indoor side heat exchanger 5 and an inner machine electronic expansion valve 8. The temperature controller 4 is connected with the external machine through a first four-way valve signal line 12 and is connected with the internal machine through a second four-way valve signal line 13, and the first signal line 12 and the second four-way valve signal line 13 are used for respectively sending four-way valve control signals sent by the temperature controller 4 to the corresponding connected internal machine and external machine. The inner machine electronic expansion valve 8 and the outer machine electronic expansion valve 9 are respectively used in a heating or refrigerating mode and used for throttling control in the heating or refrigerating mode, and for the communication-free air conditioning unit, the inner machine and the outer machine are independently controlled, and the inner machine and the outer machine are required to be additionally provided with the electronic expansion valve control due to the fact that the inner machine and the outer machine are required to be matched with a third party unit. The high-pressure temperature sensor 1 is used for detecting the temperature of a high-pressure pipeline on the exhaust side of the air conditioner compressor, and the exhaust temperature sensor 6 is used for detecting the temperature at the exhaust port of the air conditioner compressor.

Normally, when the air conditioning unit is controlled to start a heating mode by the temperature controller 4, the temperature controller 4 sends a four-way valve control signal to the external machine through a first four-way valve signal line 12 and sends a four-way valve control signal to the internal machine through a second four-way valve signal line 13. When heating starts, the opening degree of the internal machine electronic expansion valve 8 is set to be the maximum, 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, is condensed into refrigerant liquid after releasing heat, enters the outdoor side heat exchanger 3 for heat exchange after being throttled by the external machine electronic expansion valve 9, is evaporated into refrigerant gas, and then enters the vapor-liquid separator 2 for vapor-liquid separation through the four-way reversing valve 10, and finally returns to the compressor 7.

If the inner machine and the outer machine do not receive the four-way valve control signal sent by the temperature controller 4, the unit is considered to be in a refrigeration mode. In the refrigeration mode, the opening of the external electronic expansion valve 9 is set to be the largest, 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, is condensed into refrigerator liquid after releasing heat, enters the indoor side heat exchanger 5 for heat exchange after being throttled by the internal electronic expansion valve 8, is evaporated into refrigerant gas after being subjected to heat exchange, and then enters the vapor-liquid separator 2 for vapor-liquid separation through the four-way reversing valve 10, and finally returns to the compressor 7.

If the temperature controller 4 is disconnected from the four-way valve signal line of the internal machine, that is, the second four-way valve signal line 13 is abnormal, the internal machine cannot receive the four-way valve control signal. If the heating mode is started at this time, the external machine normally receives the four-way valve control signal, but the external machine cannot recognize whether the internal machine receives the four-way valve control signal, at this time, the external machine electronic expansion valve 9 of the external machine throttles according to the control logic in the heating mode, and the internal machine cannot receive the four-way valve control signal, so that the current air conditioner is considered to be in the cooling mode, and the internal machine electronic expansion valve 8 throttles according to the control logic in the cooling mode. Therefore, the two electronic expansion valves are throttled simultaneously, so that the quantity of the refrigerant circulating in the system is suddenly reduced, the operation efficiency of the air conditioner is influenced, and the problem that the air conditioner system is abnormal or even cannot normally operate is caused.

The invention provides an abnormality detection and control method for an air conditioner, which is characterized in that whether the quantity of refrigerant flowing through a compressor of the air conditioner is suddenly reduced is detected in a heating mode of the air conditioner, if the quantity of refrigerant is suddenly reduced, whether an internal machine electronic expansion valve acts abnormally is determined according to a high-pressure temperature and a preset standard high-pressure temperature, and further whether a signal line connecting a temperature controller with an indoor machine is abnormal can be rapidly and effectively identified, so that the problems of low operation efficiency, abnormal operation and the like caused by the sudden reduction of the refrigerant of an air conditioning system are avoided.

According to an embodiment of the present invention, there is provided an abnormality detection and control method of an air conditioner, the air conditioner being a communication-free air conditioner unit, the communication-free air conditioner unit including: the indoor unit comprises a temperature controller, an indoor unit and an outdoor unit, wherein the temperature controller is provided with a first four-way valve signal line and a second four-way valve signal line; the temperature controller is connected to a terminal of a corresponding temperature controller on the main board of the outdoor unit through the first four-way valve signal line, and is connected to a terminal of a corresponding temperature controller on the main board of the indoor unit through the second four-way valve signal line; the outdoor unit is provided with an external motor expansion valve and a four-way valve; the indoor unit is provided with an internal machine 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 the four-way valve control signal to the indoor unit through the second four-way valve control line, wherein the four-way valve control signals sent to the indoor unit and the outdoor unit by the temperature controller are consistent, and for a non-communication temperature controller, 24V electric signals are generally sent if a unit operates in a heating mode; for example: heating to obtain electricity, and sending a 24V electric signal to the internal machine and the external machine by the temperature controller respectively; the electric signal is not sent when refrigerating, and the signals of 0V are received by the inner machine and the outer machine; therefore, if the unit does not receive the 24V electric signal of the four-way valve, the unit is considered as a refrigeration mode; the outdoor unit controls the action of the external machine electronic expansion valve and the four-way valve according to the four-way valve control signal, and the indoor unit controls the action of the internal machine electronic expansion valve according to the four-way valve control signal. A schematic flow chart of an embodiment of the method of the present invention is shown in fig. 1. The abnormality detection and control method of the air conditioner may include: comprising the following steps: step S110 to step S150.

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 confirmed that the air conditioner is operating in a heating mode.

At step S120, if the air conditioner is operated in the heating mode, acquiring a temperature of a high-pressure pipeline on an exhaust side of a compressor of the air conditioner, and recording the temperature as a high-pressure temperature, specifically, a high-pressure side pressure detected by a high-pressure sensor, wherein the high-pressure temperature is a temperature corresponding to the high-pressure; acquiring the temperature at an exhaust port of a compressor of the air conditioner, and recording the temperature as an exhaust temperature, wherein certain temperature attenuation exists between the exhaust temperature and a high-pressure temperature, and the high-pressure temperature is lower than the exhaust temperature; acquiring the running frequency of a compressor of the air conditioner and recording the running frequency as the compressor frequency; and if the outdoor unit receives the four-way valve control signal sent by the temperature controller, confirming that the air conditioner is operated in a heating mode.

At step S130, the high pressure temperature, the discharge temperature, and the compressor frequency are compared with set deviation values, 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.

Before the air conditioner formally operates, a preset data table comprising 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.

In some embodiments, in step S130, the high pressure temperature, the discharge temperature, and the compressor frequency are compared with set deviation values, 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, which is described in the following exemplary embodiments.

Fig. 2 is a flow chart of an embodiment of 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 invention, as shown in fig. 2, in step S130, the high pressure temperature, the exhaust temperature and the compressor frequency are respectively compared with set deviation values, and a 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: step S210 to step S240.

Step S210, recording the difference value between the current high-pressure temperature and the high-pressure temperature acquired before the first preset time as the high-pressure temperature fluctuation value; recording the difference between the current exhaust temperature and the exhaust temperature acquired before the first preset time as the exhaust temperature fluctuation value; recording the difference value of the current compressor frequency and the compressor frequency acquired before the first preset time as the compressor frequency fluctuation value; the first preset time is shorter and can be set to 10-15 s.

Step S220, determining whether the high pressure temperature fluctuation value is greater than a high pressure temperature setting deviation value, the exhaust gas temperature fluctuation value is less than or equal to an exhaust gas temperature setting deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency setting deviation value.

Step S230, if yes, determining that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

Step S240, if not, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature to a preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

Specifically, after the air conditioning unit is installed, in a test operation stage, the air conditioning unit establishes a data table of high-pressure temperature, compressor frequency and exhaust temperature based on parameters of a test operation process, and 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 the function is to judge whether the high-pressure temperature of the air conditioner is suddenly abnormal or not in the subsequent process.

If the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced, the amount of high-temperature and high-pressure refrigerant discharged by the compressor is reduced, so that the exhaust temperature and the high-pressure temperature are suddenly increased, wherein the high-pressure temperature is the most direct influence, large change can be generated in a short time, and the exhaust temperature is also increased, but no large sudden change exists in a short time. Thus, the high-pressure temperature fluctuation value is made larger than the high-pressure temperature setting difference value, and the exhaust gas temperature fluctuation value is smaller than or equal to the exhaust gas temperature setting difference value. The frequency adjustment period of the compressor is generally 1-2 min, and the first preset time is shorter, so that the frequency of the compressor is not greatly changed in a short time, that is, the frequency fluctuation value of the compressor is smaller than or equal to the frequency setting difference value of the compressor.

Fig. 7 is a flowchart of an embodiment of a four-way valve signal line abnormality detection and control method of an air conditioner according to the present invention, as shown in fig. 7, the four-way valve signal line abnormality detection and control method of the present invention includes:

step 1, in a test operation stage after the air conditioning unit is installed, establishing a high-pressure temperature T based on parameters obtained by test operation _{High pressure} With compressor frequency f, discharge temperature T _{Exhaust gas} And (3) executing the step (2) when the air conditioning unit is started to operate.

Step 2, detecting whether the external machine receives a four-way valve signal from the temperature controller or not when the air conditioner is started and operated, namely confirming whether the air conditioner is started in a heating mode or not; if not, namely the air conditioner does not start the heating mode, the air conditioner is controlled according to normal adjusting logic; if the air conditioner is received, namely, the air conditioner starts a heating mode, the step 3 is executed.

Step 3, continuously detecting the high-pressure temperature T of the air conditioner _{High pressure} Compressor frequency f, discharge temperature T _{Exhaust gas} And judges whether the high pressure temperature T within the first preset time T1 is satisfied at the same time _{High pressure} Fluctuation value > A, exhaust temperature T _{Exhaust gas} The fluctuation value is less than or equal to B, and the fluctuation value of the compressor frequency H is less than or equal to 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; detecting the high-pressure temperature T at intervals of T1 time _{High pressure} Compressor frequency f, discharge temperature T _{Exhaust gas} And taking the difference between the currently detected value and the last detected value as a fluctuation value.

If all the judging conditions are met at the same time, the refrigerant flowing through the air conditioner compressor is considered to be suddenly reduced, and then the step 4 is executed; otherwise the first set of parameters is selected,with the current detected high-pressure temperature T _{High pressure} Compressor frequency f, discharge temperature T _{Exhaust gas} Updating the data into a preset data table, and then re-executing the step 3.

Wherein the high pressure temperature, the exhaust temperature and the frequency in the data table are corresponding, and the high pressure temperature T detected currently _{High pressure} Updated to the corresponding discharge temperature and high pressure temperature location at the compressor frequency in the data table. For example, the current detected exhaust temperature is 55 ℃, the compressor frequency is 60Hz, the high-pressure temperature is 60 ℃, the high-pressure temperature position corresponding to the exhaust temperature of 55 ℃ and the compressor frequency of 60Hz is searched in the data table, the detected high-pressure temperature of 60 ℃ is updated to the position, and if no data exists before the position, the data is added. The data in the data table is always the latest data in the current state by updating the data table in real time, so that the judgment of judging whether the high-pressure temperature is suddenly changed or not according to the data table is more accurate, erroneous 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 or not is improved.

According to the scheme, whether the refrigerant quantity in the system is suddenly reduced or not can be accurately distinguished by judging the high-pressure temperature fluctuation value, the exhaust temperature fluctuation value and the magnitude relation between the compressor frequency fluctuation value and the corresponding set deviation value, and then the reason of the sudden refrigerant quantity reduction is determined. And identifying whether the four-way valve signal wires of the temperature controller and the indoor unit are abnormal according to the high-pressure temperature and the high-pressure temperature in the preset data table, thereby rapidly positioning the reason of abnormality of the system, avoiding the system from being in an abnormal state for a long time and improving the reliability of the system.

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

In some embodiments, in step S140, a specific process of determining whether the second four-way valve signal line connected between the thermostat and the indoor unit is abnormal is determined according to the current high-pressure temperature and a preset standard high-pressure temperature, which is described in the following exemplary embodiments.

Fig. 3 is a flowchart of an embodiment of determining whether the high-pressure temperature is abnormal according to the high-pressure temperature and a preset standard high-pressure temperature in the method of the present invention, as shown in fig. 3, in step S140, a specific process of determining whether a 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 includes: step S310 to step S340.

And step S310, acquiring the corresponding standard high-pressure temperature from a preset data table according to the current exhaust temperature and the current compressor frequency.

Step S320, determining whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is larger than the set difference of the standard high-pressure temperature; the standard high pressure temperature setting difference may be set to 2 ℃.

And step S330, if the temperature of the temperature controller is higher than the preset temperature, determining that the high-pressure temperature of the air conditioner is abnormal, and then determining whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the high-pressure temperature.

Step S340, if the temperature is less than or equal to the preset data table, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

Since the high-pressure temperature has been determined to have a large change by judging the magnitude relation between the high-pressure temperature fluctuation value and the high-pressure temperature setting deviation value, if the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is larger than the standard high-pressure temperature setting deviation value, the high-pressure temperature mutation is obvious, the abnormality of the system has great influence on the operation of the air conditioner, and at the moment, the reason of the abnormality is required to be further confirmed, namely, whether the four-way valve signal lines of the temperature controller and the indoor unit are abnormal or not is determined according to the high-pressure temperature, so that the fault of the air conditioner is positioned, and the subsequent control or maintenance of the air conditioner is facilitated.

In some embodiments, in step S330, a specific process of determining whether the second four-way valve signal line connected to the indoor unit by the thermostat is abnormal according to the high-pressure temperature is described as an example below.

Fig. 4 is a flow chart of an embodiment of determining whether a four-way valve signal line connected to an indoor unit of a thermostat is abnormal according to a high-voltage temperature in the method of the present invention, as shown in fig. 4, in step S330, a specific process of determining whether a second four-way valve signal line connected to the indoor unit of the thermostat is abnormal according to the high-voltage temperature includes: step S410 to step S440.

Step S410, setting the opening degree of the external electronic expansion valve to be the maximum opening degree, and then acquiring the current high-pressure temperature, and recording the current high-pressure temperature as a first high-pressure temperature; after a second preset time, acquiring the current high-pressure temperature again, and recording the current high-pressure temperature as a second high-pressure temperature; the second preset time may be set to 5 minutes.

Step S420, determining 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 difference; the first high pressure temperature setting difference may be set to 5 ℃.

And step S430, if the temperature controller is larger than the indoor unit, determining that the second four-way valve signal line connected with the temperature controller is abnormal.

And step S440, if the temperature of the air conditioner is less than or equal to the preset temperature, determining that the external electronic expansion valve is blocked, reporting fault information of the blocking of the external electronic expansion valve, and controlling the air conditioner to stop.

Specifically, if the reason of the abnormality of the high-pressure temperature jump is that the four-way valve signal line connected with the indoor unit by the temperature controller is abnormal, that is, the indoor unit does not receive the four-way valve control signal, at this time, the indoor unit controls the indoor unit electronic expansion valve to throttle according to the refrigerating mode, and the outdoor unit controls the outdoor unit electronic expansion valve to throttle according to the operation logic of the heating mode, so that the indoor unit electronic expansion valve and the outdoor unit electronic expansion valve simultaneously throttle in the current state, and the refrigerant amount of the system is reduced suddenly. If the opening of the external electronic expansion valve is set to be the maximum at this moment, then the internal electronic expansion valve is only throttled, which is equivalent to reducing the throttle degree, and the amount of refrigerant circulating in the system is increased, so that the amount of refrigerant flowing into the air conditioner compressor is increased, the high-pressure temperature is the maximum due to the change of the amount of refrigerant, and the high-pressure temperature is reduced by increasing the amount of refrigerant, so that after the second preset time, the high-pressure temperature has obviously changed, and then the difference between the first high-pressure temperature and the second high-pressure temperature is detected to be greater than the first high-pressure temperature setting difference. If the difference between the first high-pressure temperature and the second high-pressure temperature is detected to be smaller than or equal to the first high-pressure temperature setting difference, the fact that the opening degree of the external electronic expansion valve is set to be the largest does not reduce the system throttling degree is indicated, the amount of refrigerant flowing into the air conditioner compressor is not increased, at the moment, the external electronic expansion valve is considered to be blocked, and the throttling degree is not influenced by the fact that the opening degree of the external electronic expansion valve is regulated due to the influence of the blocking.

Fig. 7 is a flow chart of an embodiment of a four-way valve signal line abnormality detection and control method of an air conditioner according to the present invention, as shown in fig. 7, and further includes:

step 4, obtaining the high-pressure temperature T corresponding to the current exhaust temperature and the compressor frequency from the data table _{High pressure 1} Judging |T _{High pressure} -T _{High pressure 1} And | > the set value D, which may be 2 ℃. If |T _{High pressure} -T _{High pressure 1} And if the temperature is smaller than or equal to D, the current detected high-pressure temperature T _{High pressure} Compressor frequency f, discharge temperature T _{Exhaust gas} Updating the data into a preset data table, returning to the step 3, and starting to execute from the step 3; if |T _{High pressure} -T _{High pressure 1} And executing step 5 if i > D.

Step 5, setting the opening degree of the external electronic expansion valve to be maximum, and recording the high-pressure temperature T at the moment _{High pressure 2} After time T2 the high pressure temperature T is again recorded _{High pressure 3} Then judge T _{High pressure 2} -T _{High pressure 3} Setting value E; the set value E may be 5℃and the time t2 may be set to 5 minutes.

If T _{High pressure 2} -T _{High pressure 3} E > E, consider the temperature controller and the internal machineAfter the four-way valve signal line is abnormal, reporting fault information of the abnormality of the four-way valve signal lines of the temperature controller and the internal machine; if T _{High pressure 2} -T _{High pressure 3} And E, if the temperature is less than or equal to E, the external machine electronic expansion valve is considered to be blocked, then fault information of the blocking of the external machine electronic expansion valve is reported, and the air conditioning unit is controlled to stop.

According to the scheme, under the condition that the sudden reduction of the refrigerant quantity and the abnormality of the high-pressure temperature of the air conditioner are determined, the influence of the opening degree of the external machine electronic expansion valve on the high-pressure temperature is determined, the system fault cause is that the temperature controller and the internal machine four-way valve are abnormal or the external machine electronic expansion valve is blocked, and corresponding fault information prompt and shutdown of the air conditioner unit are carried out, so that the unit is prevented from running in an abnormal state for a long time, the running reliability of the unit is ensured, the abnormality detection mechanism of the air conditioner is more comprehensive and intelligent, and the use experience of a user is improved.

And at step S150, if the second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal, reporting fault information of the abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit.

According to the scheme, when the air conditioning unit operates in a heating mode, the high-pressure temperature, the compressor frequency and the exhaust temperature of the air conditioner are continuously obtained, whether the quantity of the refrigerant flowing through the compressor of the air conditioner is suddenly reduced or not is determined through the comparison result of the high-pressure temperature, the compressor frequency and the exhaust temperature with the set difference value, if the quantity of the refrigerant is suddenly reduced, whether a four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not is judged according to the high-pressure temperature and the preset standard high-pressure temperature, and then the reason of the sudden reduction of the quantity of the refrigerant is rapidly positioned, the air conditioner is prevented from operating for a long time in an abnormal state, the operation efficiency is influenced, and the reliability of the air conditioning unit is ensured.

By adopting the technical scheme, when the communication-free air conditioning unit operates in a heating mode, the high-pressure temperature fluctuation value, the exhaust temperature fluctuation value and the magnitude relation between the compressor frequency fluctuation value and the set deviation value are judged according to the acquired high-pressure temperature, exhaust temperature and compressor frequency, so that whether the quantity of refrigerant flowing through the air conditioning compressor is suddenly reduced is determined; if the sudden reduction of the refrigerant quantity is determined, judging that the absolute value of the difference value between the current high-pressure temperature and the preset standard high-pressure temperature is larger 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 suddenly abnormal or not; if the high-pressure temperature is determined to be suddenly abnormal, setting the opening of the external electronic expansion valve to be the maximum opening, and determining whether the difference value between the first high-pressure temperature and the second high-pressure temperature is larger than the first high-pressure temperature setting difference value or not by judging whether the difference value is larger than the first high-pressure temperature setting difference value, so as to determine that the reason of the system abnormality is that the four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or the external electronic expansion valve is blocked; and after determining the abnormal reason, reporting fault information, and controlling the air conditioner to stop according to the fault. Therefore, the fault reasons can be rapidly and accurately positioned when the air conditioning unit is abnormal, the air conditioning unit is prompted and controlled by fault information, a user can conveniently maintain or correspondingly control the air conditioning unit, the air conditioning unit is prevented from running in an abnormal state for a long time, the running reliability of the air conditioning unit is improved, the air conditioning unit is controlled more intelligently, and the air conditioning use experience is improved.

According to an embodiment of the present invention, there is also provided an abnormality detection and control apparatus of an air conditioner corresponding to the abnormality detection and control method of an air conditioner. The air conditioner is a communication-free air conditioning unit, and the communication-free air conditioning unit comprises: the indoor unit comprises a temperature controller, an indoor unit and an outdoor unit, wherein the temperature controller is provided with a first four-way valve signal line and a second four-way valve signal line; the temperature controller is connected to a terminal of a corresponding temperature controller on the main board of the outdoor unit through the first four-way valve signal line, and is connected to a terminal of a corresponding temperature controller on the main board of the indoor unit through the second four-way valve signal line; the outdoor unit is provided with an external motor expansion valve and a four-way valve; the indoor unit is provided with an internal machine 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 the four-way valve control signal to the indoor unit through the second four-way valve control line, wherein the four-way valve control signals sent to the indoor unit and the outdoor unit by the temperature controller are consistent, and for a non-communication temperature controller, 24V electric signals are generally sent if a unit operates in a heating mode; for example: heating to obtain electricity, and sending a 24V electric signal to the internal machine and the external machine by the temperature controller respectively; the electric signal is not sent when refrigerating, and the signals of 0V are received by the inner machine and the outer machine; therefore, if the unit does not receive the 24V electric signal of the four-way valve, the unit is considered as a refrigeration mode; the outdoor unit controls the action of the external machine electronic expansion valve and the four-way valve according to the four-way valve control signal, and the indoor unit controls the action of the internal machine electronic expansion valve according to the four-way valve control signal. Referring to fig. 5, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The abnormality detection and control device of the air conditioner may include: an acquisition unit 102 and a processing unit 104.

The processing unit 104 is configured to confirm that the air conditioner is operating in the heating mode if the outdoor unit receives a four-way valve control signal sent by the temperature controller through the first four-way valve control line. The specific function and process of the processing unit 104 refer to step S110.

The acquiring unit 102 is configured to acquire, if the air conditioner is operated in a heating mode, a temperature of a high-pressure pipeline on a compressor exhaust side of the air conditioner, and record the temperature as a high-pressure temperature, specifically, a pressure on the high-pressure side detected by a high-pressure sensor, where the high-pressure temperature is a temperature corresponding to the high-pressure; acquiring the temperature at an exhaust port of a compressor of the air conditioner, and recording the temperature as an exhaust temperature, wherein certain temperature attenuation exists between the exhaust temperature and a high-pressure temperature, and the high-pressure temperature is lower than the exhaust temperature; acquiring the running frequency of a compressor of the air conditioner and recording the running frequency as the compressor frequency; and if the outdoor unit receives the four-way valve control signal sent by the temperature controller, confirming that the air conditioner is operated in a heating mode. The specific function and process of the acquisition unit 102 refer to step S120.

The processing unit 104 is further configured to compare the high pressure temperature, the discharge temperature, and the compressor frequency with set deviation values, 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 function and process of the processing unit 104 refer to step S130.

The processing unit 104 is specifically further configured to pre-establish a preset data table including a standard high pressure temperature, an exhaust gas temperature, and a compressor frequency, where the standard high pressure temperature corresponds to the exhaust gas temperature and the compressor frequency, and the corresponding standard high pressure temperature can be determined according to the exhaust gas temperature and the compressor frequency.

The processing unit 104 compares the high pressure temperature, the exhaust temperature, and the compressor frequency with set deviation values, and determines whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, including:

the processing unit 104 is specifically further configured to record, as the high-pressure temperature fluctuation value, a difference between the current high-pressure temperature and the high-pressure temperature acquired before the first preset time; recording the difference between the current exhaust temperature and the exhaust temperature acquired before the first preset time as the exhaust temperature fluctuation value; recording the difference value of the current compressor frequency and the compressor frequency acquired before the first preset time as the compressor frequency fluctuation value; the first preset time is shorter and can be set to 10-15 s. The specific function and process of the processing unit 104 refer to step S210.

The processing unit 104 is specifically further configured to determine whether the high pressure temperature fluctuation value is greater than a high pressure temperature setting deviation value, and the discharge temperature fluctuation value is less than or equal to a discharge temperature setting deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency setting deviation value. The specific function and process of the processing unit 104 refer to step S220.

The processing unit 104 is in particular further configured to determine that a sudden decrease in the amount of refrigerant flowing through the compressor of the air conditioner occurs if this is satisfied. The specific function and process of the processing unit 104 refer to step S230.

The processing unit 104 is specifically further configured to update the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into a preset data table if the exhaust temperature and the compressor frequency do not meet the preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced. The specific function and process of the processing unit 104 refer to step S240.

If all the judging conditions are met at the same time, the refrigerant flowing through the air conditioner compressor is considered to be suddenly reduced, and then the step 4 is executed; otherwise, the current detected high-pressure temperature T _{High pressure} Compressor frequency f, discharge temperature T _{Exhaust gas} Updating the data into a preset data table, and then re-executing the step 3.

The processing unit 104 is further configured to determine whether a 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 if it is determined that a sudden decrease occurs in the amount of refrigerant flowing through the compressor of the air conditioner. The specific function and process of the processing unit 104 refer to step S140.

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

the processing unit 104 is specifically further configured to obtain the corresponding standard high-pressure temperature from a preset data table according to the current exhaust temperature and the compressor frequency. The specific function and process of the processing unit 104 refer to step S310.

The processing unit 104 is specifically further configured to determine whether an absolute value of a difference between the current high-pressure temperature and the standard high-pressure temperature is greater than a standard high-pressure temperature set difference; the standard high pressure temperature setting difference may be set to 2 ℃. The specific function and process of the processing unit 104 refer to step S320.

The processing unit 104 is specifically further configured to determine that the high-pressure temperature of the air conditioner is abnormal if the high-pressure temperature is greater than the first preset value, and then determine whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the high-pressure temperature. The specific function and process of the processing unit 104 refer to step S330.

The processing unit 104 is specifically further configured to update the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature to a preset data table if the exhaust temperature and the compressor frequency are less than or equal to each other; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced. The specific function and process of the processing unit 104 refer to step S340.

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

the processing unit 104 is specifically further configured to set the opening of the external electronic expansion valve to a maximum opening, and then acquire the current high-pressure temperature, and record the current high-pressure temperature as a first high-pressure temperature; after a second preset time, acquiring the current high-pressure temperature again, and recording the current high-pressure temperature as a second high-pressure temperature; the second preset time may be set to 5 minutes. The specific function and process of the processing unit 104 refer to step S410.

The processing unit 104 is specifically further configured to determine whether a difference between the current first high-pressure temperature and the second high-pressure temperature is greater than a first high-pressure temperature set difference; the first high pressure temperature setting difference may be set to 5 ℃. The specific function and process of the processing unit 104 refer to step S420.

The processing unit 104 is specifically further configured to determine that an abnormality occurs in a four-way valve signal line connected between the temperature controller and the indoor unit if the temperature controller is greater than the indoor unit. The specific function and process of the processing unit 104 refer to step S430.

The processing unit 104 is specifically further configured to determine that the external electronic expansion valve is blocked if the external electronic expansion valve is smaller than or equal to the external electronic expansion valve, report fault information that the external electronic expansion valve is blocked, and control the air conditioner to stop. The specific function and process of the processing unit 104 refer to step S440.

step 4, from the data tableObtaining a high-pressure temperature T corresponding to the current exhaust temperature and the compressor frequency _{High pressure 1} Judging |T _{High pressure} -T _{High pressure 1} And | > the set value D, which may be 2 ℃. If |T _{High pressure} -T _{High pressure 1} And if the temperature is smaller than or equal to D, the current detected high-pressure temperature T _{High pressure} Compressor frequency f, discharge temperature T _{Exhaust gas} Updating the data into a preset data table, returning to the step 3, and starting to execute from the step 3; if |T _{High pressure} -T _{High pressure 1} And executing step 5 if i > D.

If T _{High pressure 2} -T _{High pressure 3} If the temperature controller is more than E, the four-way valve signal wires of the temperature controller and the internal machine are considered to be abnormal, and then fault information of the abnormality of the four-way valve signal wires of the temperature controller and the internal machine is reported; if T _{High pressure 2} -T _{High pressure 3} And E, if the temperature is less than or equal to E, the external machine electronic expansion valve is considered to be blocked, then fault information of the blocking of the external machine electronic expansion valve is reported, and the air conditioning unit is controlled to stop.

The processing unit 104 is further configured to report fault information of abnormality of the second four-way valve signal line connected to the temperature controller and the indoor unit if it is determined that the second four-way valve signal line connected to the temperature controller and the indoor unit is abnormal. The specific function and process of the processing unit 104 refer to step S150.

Since the processes and functions implemented by the apparatus of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing methods, the descriptions of the embodiments are not exhaustive, and reference may be made to the descriptions of the foregoing embodiments and their descriptions are omitted herein.

According to an embodiment of the present invention, there is also provided an air conditioner corresponding to the abnormality detection and control device of the air conditioner. The air conditioner may include: the abnormality detection and control device of the air conditioner described above.

Since the processes and functions implemented by the air conditioner of the present embodiment basically correspond to the embodiments, principles and examples of the foregoing apparatus, the description of the present embodiment is not exhaustive, and reference may be made to the related descriptions of the foregoing embodiments, which are not repeated herein.

According to an embodiment of the present invention, there is also provided a storage medium corresponding to an abnormality detection and control method of an air conditioner, the storage medium including a stored program, wherein the apparatus in which the storage medium is controlled to execute the abnormality detection and control method of an air conditioner described above when the program runs.

Since the processes and functions implemented by the storage medium of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing methods, the descriptions of the present embodiment are not exhaustive, and reference may be made to the related descriptions of the foregoing embodiments, which are not repeated herein.

In summary, it is readily understood by those skilled in the art that the above-described advantageous ways can be freely combined and superimposed without conflict.

The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An abnormality detection and control method of an air conditioner, the air conditioner comprising: the indoor unit comprises a temperature controller, an indoor unit and an outdoor unit, wherein the temperature controller is provided with a first four-way valve signal line and a second four-way valve signal line; the temperature controller is connected to the outdoor unit through the first four-way valve signal line, and is connected to the indoor unit through the second four-way valve signal line; the outdoor unit is provided with an external motor expansion valve and a four-way valve; the indoor unit is provided with an internal machine 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 method comprises the following steps:

If the outdoor unit receives a four-way valve control signal sent by the temperature controller through the first four-way valve control line, confirming that the air conditioner is operated in a heating mode;

when the air conditioner is confirmed to operate in a heating mode, acquiring the temperature of a high-pressure pipeline at the exhaust side of a compressor of the air conditioner, and recording the temperature as a high-pressure temperature; acquiring the temperature at an exhaust port of a compressor of the air conditioner, and recording the temperature as an exhaust temperature; acquiring the running frequency of a compressor of the air conditioner and recording the running frequency as the compressor frequency;

comparing the high-pressure temperature, the exhaust temperature and the compressor frequency with set deviation values respectively, and determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result;

if the refrigerant quantity flowing through the compressor of the air conditioner is determined to be suddenly reduced, determining whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal or not according to the current high-pressure temperature and the preset standard high-pressure temperature;

if the second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal, reporting fault information of the abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit.

2. The abnormality detection and control method of an air conditioner according to claim 1, wherein a preset data table including a standard high pressure temperature, an exhaust temperature, and a compressor frequency is previously established, wherein the standard high pressure temperature corresponds to the exhaust temperature, the compressor frequency, and the corresponding standard high pressure temperature can be determined according to the exhaust temperature and the compressor frequency;

comparing the high pressure temperature, the exhaust temperature and the compressor frequency with set deviation values respectively, and determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, wherein the method comprises the following steps of:

recording the difference value of the current high-pressure temperature and the high-pressure temperature acquired before the first preset time as the high-pressure temperature fluctuation value; recording the difference between the current exhaust temperature and the exhaust temperature acquired before the first preset time as the exhaust temperature fluctuation value; recording the difference value of the current compressor frequency and the compressor frequency acquired 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 setting deviation value, and the exhaust gas temperature fluctuation value is less than or equal to an exhaust gas temperature setting deviation value, and the compressor frequency fluctuation value is less than or equal to a compressor frequency setting deviation value;

If so, determining that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced;

if not, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into a preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

3. The abnormality detection and control method of an air conditioner according to claim 1 or 2, wherein determining whether a second four-way valve signal line connecting the thermostat and the indoor unit is abnormal according to the current high-pressure temperature and a preset standard high-pressure temperature, comprises:

acquiring the corresponding standard high-pressure temperature from a preset data table according to the current exhaust temperature and the current compressor frequency;

determining whether the absolute value of the difference between the current high-pressure temperature and the standard high-pressure temperature is larger than a set difference of the standard high-pressure temperature;

if the temperature difference is larger than the preset value, determining that the high-pressure temperature of the air conditioner is abnormal, and then determining whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the high-pressure temperature;

If the temperature is smaller than or equal to the preset data table, updating the exhaust temperature and the compressor frequency corresponding to the current high-pressure temperature into the preset data table; and then re-acquiring the high-pressure temperature, the exhaust temperature and the compressor frequency, and continuously determining whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced.

4. The abnormality detection and control method of an air conditioner according to claim 3, wherein determining whether a second four-way valve signal line connecting the thermostat and the indoor unit is abnormal according to the high-pressure temperature includes:

setting the opening of the external electronic expansion valve to be the maximum opening, and then acquiring the current high-pressure temperature, and recording the current high-pressure temperature as a first high-pressure temperature; after a second preset time, acquiring the current high-pressure temperature again, and recording the current high-pressure temperature as a second high-pressure temperature;

determining whether a difference between the current first high-pressure temperature and the second high-pressure temperature is larger than a first high-pressure temperature set difference;

if the temperature difference is larger than the preset value, determining that a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal;

if the temperature of the air conditioner is less than or equal to the preset temperature, determining that the outer electronic expansion valve is blocked, reporting fault information of the blocking of the outer electronic expansion valve, and controlling the air conditioner to stop.

5. An abnormality detection and control device of an air conditioner, the air conditioner comprising: the indoor unit comprises a temperature controller, an indoor unit and an outdoor unit, wherein the temperature controller is provided with a first four-way valve signal line and a second four-way valve signal line; the temperature controller is connected to the outdoor unit through the first four-way valve signal line, and is connected to the indoor unit through the second four-way valve signal line; the outdoor unit is provided with an external motor expansion valve and a four-way valve; the indoor unit is provided with an internal machine 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 device comprises:

the processing unit is configured to confirm that the air conditioner is operated in a heating mode if the outdoor unit receives a four-way valve control signal sent by the temperature controller through the first four-way valve control line;

an acquisition unit configured to acquire a temperature of a high-pressure pipe on a compressor discharge side of the air conditioner, which is recorded as a high-pressure temperature, in a case where it is confirmed that the air conditioner is operated in a heating mode; acquiring the temperature at an exhaust port of a compressor of the air conditioner, and recording the temperature as an exhaust temperature; acquiring the running frequency of a compressor of the air conditioner and recording the running frequency as the compressor frequency;

The processing unit is further configured to compare the high-pressure temperature, the exhaust temperature and the compressor frequency with set deviation values 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 processing unit is further configured to determine whether a second four-way valve signal line connected with the temperature controller and the indoor unit is abnormal according to the current high-pressure temperature and a preset standard high-pressure temperature if it is determined that the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced;

and the processing unit is further configured to report fault information of abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit if the abnormality of the second four-way valve signal line connected with the temperature controller and the indoor unit is determined.

6. The abnormality detection and control device of an air conditioner according to claim 5, wherein the processing unit is specifically further configured to create a preset data table in advance including a standard high-pressure temperature, an exhaust temperature, and a compressor frequency, wherein the standard high-pressure temperature corresponds to the exhaust temperature, the compressor frequency, and the corresponding standard high-pressure temperature can be determined from the exhaust temperature and the compressor frequency;

The processing unit compares the high pressure temperature, the exhaust temperature and the compressor frequency with set deviation values respectively, determines whether the amount of refrigerant flowing through the compressor of the air conditioner is suddenly reduced according to the comparison result, and comprises the following steps:

7. The abnormality detection and control apparatus of an air conditioner according to claim 5, wherein the processing unit determining whether a second four-way valve signal line, through which the thermostat is connected to the indoor unit, is abnormal according to the current high-pressure temperature and a preset standard high-pressure temperature, includes:

8. The abnormality detection and control apparatus of an air conditioner according to claim 7, wherein the processing unit determining whether a four-way valve signal line connecting the thermostat and the indoor unit is abnormal according to the high-pressure temperature includes:

if the temperature is higher than the preset value, determining that a four-way valve signal line connected with the temperature controller and the indoor unit is abnormal;

9. An air conditioner, comprising: the abnormality detection and control device for an air conditioner according to any one of claims 5 to 8.

10. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to execute the abnormality detection and control method of the air conditioner according to any one of claims 1 to 4.