Air conditioner control method, controller, air conditioner, and computer readable storage medium

Abstract

Embodiments of the present application provide an air conditioner control method, a controller, an air conditioner, and a computer readable storage medium. The air conditioner control method comprises the following steps: obtaining a current refrigerant concentration value and fault sign information fed back by a refrigerant sensor (S210); and when the fault sign information indicates a sensor out-of-range fault, determining a refrigerant leakage state of the air conditioner on the basis of the current refrigerant concentration value (S220).

Description

Air conditioner control method, controller, air conditioner and computer readable storage medium

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to Chinese Patent Application No. 202410429867.2, filed on April 10, 2024, entitled "Air conditioner control method, controller, air conditioner and computer readable storage medium", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of air conditioners, and in particular to an air conditioner control method, controller, air conditioner and computer readable storage medium. BACKGROUND

[0004] In related technologies, the refrigerant leakage detection of an air conditioner is usually implemented by using a refrigerant sensor. Specifically, the refrigerant sensor measures the refrigerant concentration of a current space periodically after being powered on. A main control board of the air conditioner communicates with the refrigerant sensor and periodically acquires the current refrigerant concentration measurement result. When the refrigerant concentration reaches a preset value, the main control board determines that refrigerant leakage occurs currently and executes a corresponding refrigerant leakage processing program.

[0005] However, since the measurement of the sensor has a range, the measurement result beyond the measurement range is unreliable. The traditional refrigerant detection method only determines whether the refrigerant concentration returned by the sensor is in a safe range, and does not consider the factor of the measurement range. Therefore, the measurement result of the traditional refrigerant detection method is not accurate enough. SUMMARY

[0006] The present application aims to at least partially solve one of the technical problems existing in the prior art. To this end, the present application proposes an air conditioner control method, controller, air conditioner and computer readable storage medium, which aims to improve the accuracy of the measurement result.

[0007] In a first aspect, embodiments of the present application provide an air conditioner control method, the air conditioner comprising a refrigerant sensor, the method comprising:

[0008] acquiring a current refrigerant concentration value and fault flag information fed back by the refrigerant sensor; and

[0009] when the fault flag information is a sensor out-of-range fault, determining a refrigerant leakage state of the air conditioner according to the current refrigerant concentration value.

[0010] According to some embodiments of the present application, the determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value comprises: when the current refrigerant concentration value is greater than or equal to a first concentration threshold, determining that the air conditioner has a refrigerant leakage.

[0011] According to some embodiments of the present application, the determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value comprises: when the current refrigerant concentration value is less than a first concentration threshold, determining that the air conditioner has no refrigerant leakage.

[0012] According to some embodiments of the present application, after the current refrigerant concentration value and the fault flag information of the refrigerant sensor are obtained, the air conditioner control method further comprises: when the fault flag information is a non-sensor over-range fault, determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value and a preset concentration threshold.

[0013] According to some embodiments of the present application, the determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value and a preset concentration threshold comprises: when the current refrigerant concentration value is greater than a second concentration threshold, determining that the refrigerant leakage state of the air conditioner is a serious leakage state.

[0014] According to some embodiments of the present application, the determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value and a preset concentration threshold comprises: when the current refrigerant concentration value is greater than a third concentration threshold and less than or equal to a second concentration threshold, determining that the refrigerant leakage state of the air conditioner is a general leakage state, wherein the third concentration threshold is less than the second concentration threshold.

[0015] According to some embodiments of the present application, the determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value and a preset concentration threshold comprises: when the current refrigerant concentration value is greater than a fourth concentration threshold and less than or equal to a third concentration threshold, determining that the air conditioner has a refrigerant leakage, wherein the fourth concentration threshold is less than the third concentration threshold.

[0016] According to some embodiments of the present application, the determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value and a preset concentration threshold comprises: when the current refrigerant concentration value is less than or equal to a fourth concentration threshold, determining that the air conditioner has no refrigerant leakage.

[0017] According to some embodiments of the present application, the sensor over-range fault is determined by the following steps:

[0018] obtaining an environmental parameter; and

[0019] In a case where the environmental parameter is within a preset reasonable range, when the current refrigerant concentration value is outside a calibration range of the refrigerant sensor, it is determined that the refrigerant sensor has a sensor out-of-range fault.

[0020] According to some embodiments of the present application, after the determination that the refrigerant sensor has a sensor out-of-range fault, the air conditioner control method further comprises:

[0021] obtaining a voltage measurement value fed back by the refrigerant sensor, inputting the voltage measurement value into a preset piecewise function model, and outputting an optimized refrigerant concentration value through the piecewise function model; and

[0022] The piecewise function model comprises a plurality of linear functions, each of the linear functions comprises a first input variable, a preset coefficient and a preset constant, the first input variable is assigned a value of the voltage measurement value, a product value of the first input variable and the preset coefficient and a sum of the preset constant are the optimized refrigerant concentration value, and the first input variable in one of the linear functions corresponds to one voltage measurement value interval.

[0023] According to some embodiments of the present application, the sensor out-of-range fault is determined by the following steps:

[0024] obtaining an environmental parameter; and

[0025] In a case where the environmental parameter is outside a preset reasonable range, it is determined that the refrigerant sensor has a sensor out-of-range fault.

[0026] According to some embodiments of the present application, after the determination that the refrigerant sensor has a sensor out-of-range fault, the air conditioner control method further comprises:

[0027] obtaining a voltage measurement value fed back by the refrigerant sensor, inputting the environmental parameter and the voltage measurement value into a preset multivariate function, and outputting an optimized refrigerant concentration value through the multivariate function; and

[0028] The multivariate function comprises a second input variable, a third input variable, an environmental weight parameter and a voltage weight parameter, the second input variable is assigned a value of the voltage measurement value, the third input variable is assigned a value of the environmental parameter, a product value of the second input variable and the environmental weight parameter and a product value of the third input variable and the voltage weight parameter are summed to be the optimized refrigerant concentration value.

[0029] According to some embodiments of the present application, the environmental parameter comprises at least one of the following: environmental temperature, environmental humidity, light intensity, and environmental air pressure.

[0030] According to some embodiments of the present application, when there is a refrigerant leak in the air conditioner, the air conditioner control method further includes: triggering a faulty indoor unit with refrigerant leakage to generate fault information, and sending the fault information to the outdoor unit.

[0031] According to some embodiments of the present application, when there is a refrigerant leak in the air conditioner, the air conditioner control method further includes: triggering the fan of the faulty indoor unit with the refrigerant leak to run at a maximum speed.

[0032] According to some embodiments of the present application, when there is a refrigerant leak in the air conditioner, the air conditioner control method further includes: triggering a buzzer alarm of the faulty indoor unit with the refrigerant leak and maintaining the buzzer alarm for a preset time period.

[0033] According to some embodiments of the present application, when there is a refrigerant leak in the air conditioner, the air conditioner control method further includes: triggering the faulty indoor unit with the refrigerant leak to shield the receiving control signal.

[0034] According to some embodiments of the present application, when the fault sign information is a sensor over-range fault and there is no refrigerant leakage in the air conditioner, the air conditioner control method further includes: triggering the faulty indoor unit with the sensor over-range fault to generate fault information, and sending the fault information to the outdoor unit.

[0035] According to some embodiments of the present application, the air conditioner control method further includes:

[0036] determining that the refrigerant sensor is faulty; and

[0037] The faulty indoor unit corresponding to the refrigerant sensor is triggered to generate fault information, and the fault information is sent to the outdoor unit.

[0038] According to some embodiments of the present application, after sending the fault information to the outdoor unit, the air conditioner control method further includes: when the air conditioner is a one-to-one air conditioner, recycling the refrigerant to the outdoor unit and controlling the outdoor unit to shut down.

[0039] According to some embodiments of the present application, after sending the fault information to the outdoor unit, the air conditioner control method further includes: when the air conditioner is a one-to-many air conditioner, sending the fault information to the non-faulty indoor unit through the outdoor unit, and recovering the refrigerant to the outdoor unit and the non-faulty indoor unit.

[0040] In a second aspect, an embodiment of the present application provides a controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the air conditioner control method of the first aspect described above when executing the computer program.

[0041] In a third aspect, embodiments of the present application provide an air conditioner, comprising the controller of the second aspect.

[0042] In a fourth aspect, embodiments of the present application provide a computer readable storage medium, storing computer executable instructions for performing the air conditioner control method of the first aspect.

[0043] According to the technical solution of the embodiments of the present application, at least the following beneficial effects are achieved: first, the embodiments of the present application will acquire the current refrigerant concentration value and the fault flag information fed back by the refrigerant sensor, and then, when the fault flag information is a sensor out-of-range fault, the refrigerant leakage state of the air conditioner is determined according to the current refrigerant concentration value. Since the embodiments of the present application not only determine whether the refrigerant concentration detected by the refrigerant sensor is within the safe range, but also determine whether the refrigerant sensor has an out-of-range fault, the embodiments of the present application can make the measurement result of the refrigerant sensor more accurate and comprehensive.

[0044] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0045] The accompanying drawings are included to provide a further understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation on the technical solution of the present application.

[0046] FIG. 1 is a schematic diagram of an implementation environment for performing an air conditioner control method according to an embodiment of the present application;

[0047] FIG. 2 is a flowchart of an air conditioner control method according to an embodiment of the present application;

[0048] FIG. 3 is a flowchart of an air conditioner control method according to another embodiment of the present application;

[0049] FIG. 4 is a flowchart of a sensor out-of-range fault determination process according to an embodiment of the present application;

[0050] FIG. 5 is a whole flowchart of refrigerant out-of-range detection in an air conditioner control method according to an embodiment of the present application;

[0051] FIG. 6 is a whole flowchart of refrigerant fault execution action in an air conditioner control method according to an embodiment of the present application;

[0052] FIG. 7 is a schematic diagram of a controller for performing an air conditioner control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] The embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are exemplary only, and are merely intended to explain the present application, and are not to be understood as limiting the present application.

[0054] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0056] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0057] In some cases, the refrigerant leakage detection of the air conditioner is usually realized by using a refrigerant sensor. Specifically, the refrigerant sensor measures the refrigerant concentration of the current space periodically after being powered on. The main control board of the air conditioner communicates with the refrigerant sensor and periodically acquires the current refrigerant concentration measurement result. When the refrigerant concentration reaches a preset value, the main control board judges that refrigerant leakage occurs currently and executes a corresponding refrigerant leakage processing program.

[0058] However, since the measurement of the sensor has a range, the measurement result beyond the measurement range is unreliable. The traditional refrigerant detection method only judges whether the refrigerant concentration returned by the sensor is in the safe interval, and does not consider the factor of the measurement range, so the measurement result of the traditional refrigerant detection method is not accurate enough.

[0059] Based on the above situation, the embodiments of the present application propose an air conditioner control method, a controller, an air conditioner and a computer readable storage medium, aiming to improve the accuracy of the measurement result.

[0060] The various embodiments of the implementation environment of the present application are further described below with reference to the accompanying drawings.

[0061] As shown in FIG. 1, FIG. 1 is a schematic diagram of an implementation environment for performing an air conditioner control method according to an embodiment of the present application.

[0062] In an embodiment, the implementation environment includes, but is not limited to, a main control circuit board 100 and a refrigerant sensor 200, wherein the main control circuit board 100 stores a refrigerant detection program A, and the main control circuit board 100 communicates with the refrigerant sensor 200 when executing the refrigerant detection program A, so as to obtain a current refrigerant concentration value and sensor fault flag information.

[0063] In the above, as for the installation positions of the refrigerant sensor 200 and the main control circuit board 100, the refrigerant sensor 200 can be arranged near a heat exchanger of an indoor unit of an air conditioner, so as to detect the refrigerant concentration in the area where the heat exchanger of the indoor unit is located; in addition, the main control circuit board 100 can be a main control board of the indoor unit of the air conditioner.

[0064] In an embodiment, the refrigerant sensor 200 can be a photoelectric type refrigerant leakage sensor, wherein the photoelectric type refrigerant leakage sensor is a sensor based on photoelectric principle for measurement, and specifically includes, but is not limited to, the following sensors:

[0065] The first sensor, a non-dispersive infrared (NDIR) sensor: the NDIR sensor detects the concentration of refrigerant by measuring the degree of attenuation of infrared light of a specific wavelength when passing through air containing refrigerant gas. The refrigerant gas absorbs infrared light of a specific wavelength, and the photosensitive element inside the sensor can detect this attenuation, so as to calculate the concentration of the refrigerant. For example, the NDIR type refrigerant leakage sensor can detect the R32 gas widely used in air conditioner refrigerants.

[0066] The second sensor, a refrigerant leakage sensor of AM4207 model on the market, which adopts infrared double-beam technology, can better solve the influence of temperature and humidity and device aging on measurement accuracy while improving product life, has better long-term use stability and higher reliability, and is suitable for real-time monitoring of refrigerant R290 leakage.

[0067] The third sensor, a liquid leakage sensor of WL10 series on the market, although this sensor is mainly used for liquid leakage detection, its working principle also involves optical technology. The light emitted by the LED in the sensor is reflected to the detector through the prism, and when the liquid reaches the prism position to cause the light to decrease, the detector will detect the change and send a signal.

[0068] However, the measurement range of the photoelectric type refrigerant leakage sensor is affected by the changes of environmental parameters as follows:

[0069] Temperature environmental parameter: Changes in temperature can affect the performance of the photoelectric element of the photoelectric sensor, thereby affecting the sensitivity and accuracy of the sensor. In a low-temperature environment, the sensitivity of the photoelectric sensor may decrease, and in a high-temperature environment, the photoelectric sensor may have false positives and other problems. Therefore, when using a photoelectric sensor, the appropriate operating temperature range should be selected according to the application environment.

[0070] Humidity environmental parameter: Changes in humidity can affect the performance of the photoelectric element of the photoelectric sensor, thereby affecting the response speed and stability of the sensor. In a high-humidity environment, the photoelectric sensor may be disturbed by humidity, resulting in increased measurement error. Therefore, when using a photoelectric sensor, changes in environmental humidity should be noted and use in a high-humidity environment should be avoided as much as possible.

[0071] Light intensity environmental parameter: Changes in light intensity can affect the sensitivity and accuracy of the photoelectric sensor. In a weak light environment, the sensitivity of the photoelectric sensor may decrease, and in a strong light environment, the photoelectric sensor may have false positives and other problems. Therefore, when using a photoelectric sensor, the appropriate operating light intensity range should be selected according to the application environment.

[0072] In summary, the measurement range of the photoelectric type refrigerant sensor 200 is affected by changes in environmental parameters. When using a photoelectric sensor, the appropriate operating temperature, humidity, and light intensity range should be selected according to the application environment to ensure that the measurement range and accuracy of the sensor meet the requirements.

[0073] In addition, it can be understood that the above-mentioned refrigerant sensor 200 can also be a metal oxide semiconductor sensor, a semiconductor gas sensor, an MP510C sensor, or other types of sensors, and the embodiments of the present application do not specifically limit the type of refrigerant sensor 200.

[0074] The working principle of the metal oxide semiconductor sensor is to use the characteristic that the resistivity of certain semiconductor materials changes with the reaction of the gas on the surface of the semiconductor. By measuring the resistance of the metal oxide semiconductor, the concentration of the refrigerant gas and vapor in the air can be obtained. For example, the TGS2630 type sensor has high sensitivity to various refrigerants such as R-404a, R-410a, and non-flammable refrigerant gases R-32, R-1234yf, etc. In addition, semiconductor gas sensors such as TGS3830 and TGS832-A00 type sensors are very sensitive to specific refrigerants such as R134a, R404a, R407c, R410, etc., and have fast response and good anti-interference ability. They usually have a small volume and are easy to integrate into air conditioning systems. In addition, the MP510C sensor is a gas sensor based on a multi-layer thick film manufacturing process, which makes heating, measuring electrodes and metal oxide semiconductor gas sensitive layers on a ceramic substrate and is packaged in a metal shell. When the detected gas is present in the environment, the conductivity of the sensor will change, so that this change can be converted into an output signal corresponding to the gas concentration through the circuit.

[0075] In addition, it should be noted that the above-mentioned various types of refrigerant sensors 200 are more or less affected by various environmental parameters, thereby reducing the accuracy of the measurement range. For example, the air pressure environmental parameter: the change of air pressure may affect the sensitivity and accuracy of the electrochemical sensor. At high altitudes, the air pressure is low, and the electrochemical sensor may become less sensitive. Therefore, when using an electrochemical sensor, the appropriate working air pressure range needs to be selected according to the application environment.

[0076] In an embodiment, the main control circuit board 100 can periodically communicate with the refrigerant sensor 200 when executing the refrigerant detection program A, continuously communicate with the refrigerant sensor 200, or non-periodically communicate with the refrigerant sensor 200, and the embodiments of the present application do not make specific limitations.

[0077] Based on the implementation environment of the above-mentioned various embodiments, the following proposes multiple overall embodiments of the air conditioner control method of the present application.

[0078] As shown in FIG. 2, FIG. 2 is a flowchart of the air conditioner control method provided by an embodiment of the present application. The air conditioner control method can include but is not limited to steps S210 and S220.

[0079] Step S210, obtaining the current refrigerant concentration value and the fault flag information fed back by the refrigerant sensor;

[0080] Step S220, when the fault flag information is a sensor out-of-range fault, determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value.

[0081] In an embodiment, first, the main control circuit board of the air conditioner obtains the current refrigerant concentration value and the fault flag information fed back by the refrigerant sensor, and then the main control circuit board determines the refrigerant leakage state of the air conditioner by simultaneously referring to the refrigerant concentration factor and the measurement range factor, that is, the embodiment of the application not only judges whether the refrigerant concentration detected by the refrigerant sensor is within the safe interval, but also judges whether the refrigerant sensor has an excessive range fault, so that the embodiment of the application can make the measurement result of the refrigerant sensor more accurate and comprehensive.

[0082] Among them, the fault flag information can be displayed in the form of numbers or letters, for example, in the case of displaying in the form of number characters, when the fault flag information is 1, it can be considered that the refrigerant sensor has a sensor excessive range fault, and when the fault flag information is 0, it can be considered that the refrigerant sensor does not have a sensor excessive range fault; or for example, in the case of displaying in the form of letter characters, when the fault flag information is a, it can be considered that the refrigerant sensor has a sensor excessive range fault, and when the fault flag information is b, it can be considered that the refrigerant sensor does not have a sensor excessive range fault.

[0083] In addition, the sensor excessive range fault refers to that the measurement value of the sensor exceeds the maximum measurement range designed by the sensor during the measurement process. This situation may cause the sensor to output an error signal, and even may damage the sensor. Among them, the causes and solutions of the sensor excessive range fault can include but are not limited to the following several kinds:

[0084] Improper range selection: If the range of the sensor is not set correctly, it may cause the output signal to exceed the normal range.

[0085] External interference: The sensor may be subject to external electromagnetic interference, causing signal fluctuations or errors.

[0086] Sensor damage: Long-term use or improper operation may cause the sensor to be damaged, such as membrane deformation or circuit board damage.

[0087] Wiring problem: wiring errors or poor contact may cause the sensor to output abnormally.

[0088] Power supply problem: If the power supply voltage of the sensor is unstable or does not meet the requirements, it may also cause an excessive range fault.

[0089] Environmental factors: extreme temperature, humidity or other environmental factors may affect the performance of the sensor.

[0090] Internal sensor problems: poor contact or component aging inside the sensor may also cause excessive range.

[0091] In addition, it should be noted that, in the step S220, the refrigerant leakage state of the air conditioner can be determined according to the current refrigerant concentration value, and the refrigerant leakage state of the air conditioner can include but is not limited to the following cases: when it is determined that the refrigerant sensor has a sensor out-of-range fault, the refrigerant leakage state of the air conditioner can be determined according to the comparison result of the current refrigerant concentration value and the first concentration threshold value.

[0092] In an embodiment, if the current refrigerant concentration value is greater than or equal to the first concentration threshold value, it is determined that the air conditioner has a refrigerant leakage; if the current refrigerant concentration value is less than the first concentration threshold value, it is determined that the air conditioner does not have a refrigerant leakage.

[0093] It can be understood that the first concentration threshold value can be pre-set, and the embodiment of the present application does not limit the value of the first concentration threshold value.

[0094] In an embodiment, if the first concentration threshold value is zero, the current refrigerant concentration value is compared with zero, and if the current refrigerant concentration value is greater than or equal to zero, it is determined that the air conditioner has a refrigerant leakage; if the current refrigerant concentration value is less than zero, it is determined that the air conditioner does not have a refrigerant leakage.

[0095] In addition, as shown in FIG. 3, FIG. 3 is a flowchart of the air conditioner control method according to another embodiment of the present application. After the step S210, the air conditioner control method further includes but is not limited to the step S310 and the step S320.

[0096] In the step S310, it is determined that the fault flag information is not a sensor out-of-range fault.

[0097] In the step S320, the refrigerant leakage state of the air conditioner is determined according to the current refrigerant concentration value and the preset concentration threshold value.

[0098] In an embodiment, when the refrigerant sensor does not have a sensor out-of-range fault, the current refrigerant concentration value is compared with the preset concentration threshold value, so as to obtain the refrigerant leakage degree of the air conditioner; the higher the current refrigerant concentration value, the more serious the refrigerant leakage of the air conditioner.

[0099] In an embodiment, the comparison result of the current refrigerant concentration value and the preset concentration threshold value can include but is not limited to the following cases:

[0100] The first comparison result: if the concentration parameter is greater than the second concentration threshold value, it means that the current space has a very high refrigerant concentration, and at this time, it is determined that the refrigerant leakage state of the air conditioner is a serious leakage state.

[0101] The second comparison result, if the concentration parameter is greater than the third concentration threshold value and less than or equal to the second concentration threshold value, indicates that the refrigerant concentration in the current space is moderate, and the refrigerant leakage state of the air conditioner is determined as a general leakage state by the embodiment of the present application.

[0102] The third comparison result, if the concentration parameter is greater than the fourth concentration threshold value and less than or equal to the third concentration threshold value, indicates that the refrigerant concentration in the current space is low, and the original refrigerant leakage state is maintained and the concentration parameter is continuously acquired by the embodiment of the present application.

[0103] The fourth comparison result, if the concentration parameter is less than or equal to the fourth concentration threshold value, indicates that the refrigerant concentration in the current space is extremely low, and the embodiment of the present application determines that the air conditioner does not have refrigerant leakage. In addition, in the case that the concentration parameter is less than or equal to the third concentration threshold value, the indoor unit further detects whether there is other aspect of failure, and prompts the failure if there is, and performs failure recovery if there is not.

[0104] The second concentration threshold value is greater than the third concentration threshold value, and the third concentration threshold value is greater than the fourth concentration threshold value. In addition, the second concentration threshold value, the third concentration threshold value and the fourth concentration threshold value can be pre-set, and the embodiment of the present application does not make specific limitation.

[0105] In addition, as shown in FIG. 4, FIG. 4 is a flow chart of a sensor over-range fault determination process provided by an embodiment of the present application. The acquisition process of the sensor over-range fault includes but is not limited to steps S410, S420 and S430.

[0106] Step S410, acquiring an environmental parameter;

[0107] Step S420, determining that the refrigerant sensor has a sensor over-range fault in the case that the environmental parameter is located outside the pre-set reasonable range;

[0108] Step S430, determining that the refrigerant sensor has a sensor over-range fault in the case that the environmental parameter is located within the pre-set reasonable range, and the current refrigerant concentration value is located outside the calibration range of the refrigerant sensor.

[0109] In an embodiment, since the environmental parameter will affect the measurement range of the refrigerant sensor, the embodiment of the present application will acquire the environmental parameter of the current environment, such as the temperature, humidity, light intensity, air pressure or other parameters mentioned above, and then determine whether the refrigerant sensor has an over-range fault based on the above environmental parameters.

[0110] It should be noted that, regarding the determination process of the above sensor over-range fault, it can be performed by the master control circuit board, that is, the master control circuit board acquires the environmental parameter and determines whether the refrigerant sensor has an over-range fault based on the environmental parameter; or the acquisition process of the above over-range detection state can also be performed by the refrigerant sensor, that is, the refrigerant sensor acquires the environmental parameter and determines whether itself has an over-range fault based on the environmental parameter.

[0111] In an embodiment, for the above step S420, since the measurement range of the refrigerant sensor is affected by the environmental parameter, that is, the environmental parameter corresponding to the accurate calibrated range of the refrigerant sensor needs to be within the predetermined reasonable range, therefore, if the environmental parameter is outside the predetermined reasonable range, it indicates that the calibrated range of the refrigerant sensor is inaccurate, and the embodiment of the present application considers that the refrigerant sensor has an over-range fault.

[0112] It should be noted that, regarding the above predetermined reasonable range, it is set by the attribute of the refrigerant sensor. In addition, for each environmental parameter, there is a predetermined reasonable range corresponding to it, for example, a predetermined reasonable range corresponding to the temperature parameter, and a predetermined reasonable range corresponding to the humidity parameter.

[0113] In an embodiment, after determining that the over-range reason is that the measured environmental variable is significantly different from the calibrated environmental variable in step S420, the embodiment of the present application can also optimize and improve the calculation method of the refrigerant concentration value, as follows:

[0114] The embodiment of the present application can acquire the voltage measurement value fed back by the refrigerant sensor, and input the environmental parameter and the voltage measurement value into a predetermined multi-variable function, so as to output an optimized refrigerant concentration value through the multi-variable function; wherein the multi-variable function includes a second input variable, a third input variable, an environmental weight parameter and a voltage weight parameter, the second input variable is used to be assigned to the voltage measurement value, the third input variable is used to be assigned to the environmental parameter, and the sum of the product value of the second input variable and the environmental weight parameter and the product value of the third input variable and the voltage weight parameter is the optimized refrigerant concentration value.

[0115] Specifically, the multi-variable function of the embodiment of the present application considers the environmental parameter and the voltage measurement value at the same time, and also considers the respective weight parameters of the environmental parameter and the voltage measurement value, wherein the environmental parameter corresponds to the environmental weight parameter, and the voltage measurement value corresponds to the voltage weight parameter, then the embodiment of the present application calculates a first product value of the environmental parameter and the environmental weight parameter, and also calculates a second product value of the voltage measurement value and the voltage weight parameter, and finally adds the first product value and the second product value to obtain the optimized refrigerant concentration value.

[0116] In an embodiment, if the environmental parameter is within the preset reasonable range, it indicates that the calibration range of the refrigerant sensor is accurate, at this time, the concentration parameter and the calibration range of the refrigerant sensor need to be compared, if the concentration parameter is outside the calibration range of the refrigerant sensor, it indicates that the measurement is wrong, and the embodiment of the present application considers that the refrigerant sensor has an over-range fault.

[0117] In addition, in an embodiment, if the environmental parameter is within the preset reasonable range, it indicates that the calibration range of the refrigerant sensor is accurate, at this time, the concentration parameter and the calibration range of the refrigerant sensor need to be compared, if the concentration parameter is within the calibration range of the refrigerant sensor, it indicates that the measurement is correct, and the embodiment of the present application considers that the refrigerant sensor does not have an over-range fault.

[0118] In an embodiment, after determining the over-range reason in step S430 that the concentration of the sample to be measured is outside the concentration range of the calibrated sample, the embodiment of the present application can also optimize and improve the calculation method of the refrigerant concentration value, as follows:

[0119] The embodiment of the present application can obtain the voltage measurement value fed back by the refrigerant sensor, and input the voltage measurement value into a preset piecewise function model, so as to output an optimized refrigerant concentration value through the piecewise function model; wherein the piecewise function model includes a plurality of linear functions, each linear function includes a first input variable, a preset coefficient and a preset constant, the first input variable is used to be assigned to the voltage measurement value, and the sum of the product value of the first input variable and the preset coefficient and the preset constant is the optimized refrigerant concentration value, and the first input variable in one linear function corresponds to one voltage measurement value interval.

[0120] Specifically, in the case that the environmental parameter is within the preset reasonable range, the embodiment of the present application only needs to consider the voltage measurement value, in order to cope with the case that the refrigerant concentration value is outside the calibration range of the refrigerant sensor, the embodiment of the present application can design a plurality of linear functions, wherein each linear function corresponds to a voltage measurement value interval, the embodiment of the present application can input the voltage measurement value into the corresponding linear function, so as to calculate the optimized refrigerant concentration value.

[0121] For example, the embodiment of the present application can set three linear functions with first and last connection, and the slope of each linear function, i.e. the preset coefficient, can be different, if the voltage measurement value is within the voltage measurement value interval of the first linear function, the embodiment of the present application can calculate the optimized refrigerant concentration value through the first linear function.

[0122] In an embodiment, in the case that the air conditioner has refrigerant leakage, the air conditioner triggers the fault indoor unit with refrigerant leakage to generate fault information and sends the fault information to the outdoor unit. Specifically, if a certain indoor unit has refrigerant leakage, the indoor unit is the fault indoor unit, and at this time, the fault indoor unit sends the outdoor unit to the outdoor unit to make the outdoor unit perform corresponding refrigerant leakage processing.

[0123] In an embodiment, in the case that the air conditioner has refrigerant leakage, the air conditioner controls the fan of the fault indoor unit with refrigerant leakage to run at the maximum speed. Specifically, if a certain indoor unit has refrigerant leakage, the indoor unit is the fault indoor unit, and at this time, the fault indoor unit increases the speed of the fan until the speed of the fan reaches the maximum speed, so as to reduce the concentration of refrigerant as much as possible.

[0124] In an embodiment, in the case that the air conditioner has refrigerant leakage, the air conditioner controls the buzzer of the fault indoor unit with refrigerant leakage to alarm and maintain for a preset time length. Specifically, if a certain indoor unit has refrigerant leakage, the indoor unit is the fault indoor unit, and at this time, the fault indoor unit alarms through the buzzer, and the alarm time needs to be maintained for a preset time length, so as to achieve the purpose of reminding the user.

[0125] It can be understood that the above-mentioned preset time length can be pre-set, and the embodiment of the application does not specifically limit the value of the preset time length.

[0126] In an embodiment, in the case that the air conditioner has refrigerant leakage, the air conditioner triggers the fault indoor unit with refrigerant leakage to shield the reception of the control signal. Specifically, if a certain indoor unit has refrigerant leakage, the indoor unit is the fault indoor unit, and at this time, the fault indoor unit shields the reception of the control signal, such as shielding the user's start-up instruction, temperature adjustment instruction or other control instruction.

[0127] In an embodiment, in the case that the air conditioner has refrigerant leakage, the air conditioner triggers the fault indoor unit with refrigerant leakage to shield the reception of the control signal. Specifically, if a certain indoor unit has refrigerant leakage, the indoor unit is the fault indoor unit, and at this time, the fault indoor unit shields the reception of the control signal, such as shielding the user's start-up instruction, temperature adjustment instruction or other control instruction.

[0128] In an embodiment, if the refrigerant sensor of a certain indoor unit fails, the indoor unit will respond to generate fault information and send the fault information to the outdoor unit.

[0129] For air conditioners of different structural forms, the outdoor unit will have the following two different processing measures after receiving the fault information:

[0130] The first kind: for a one-to-one air conditioner, i.e., the air conditioner includes one outdoor unit and one indoor unit, at this time, the embodiment of the present application can recover the refrigerant to the outdoor unit and control the outdoor unit to stop.

[0131] The refrigerant recovery method for the one-to-one air conditioner can be as follows: first, control the compressor of the outdoor unit to operate, and close the stop valve on the refrigerant inlet side of the indoor unit, and open the stop valve on the refrigerant outlet side of the indoor unit; then, after the compressor operates for a period of time, make the refrigerant on the indoor unit side flow to the compressor, and close the stop valve on the refrigerant outlet side of the indoor unit, so that the refrigerant is locked in the outdoor unit, and then the compressor is closed.

[0132] The second kind: for a one-to-many air conditioner, i.e., the air conditioner includes one outdoor unit and multiple indoor units, at this time, the embodiment of the present application can send fault information to the non-fault indoor unit through the outdoor unit, and recover the refrigerant to the outdoor unit and the non-fault indoor unit.

[0133] The refrigerant recovery method for the one-to-many air conditioner can be as follows: first, control the compressor of the outdoor unit to operate; second, for the fault indoor unit, close the stop valve on the refrigerant inlet side of the fault indoor unit, and open the stop valve on the refrigerant outlet side of the fault indoor unit; in addition, for the non-fault indoor unit, open the stop valves on the refrigerant inlet side and the refrigerant outlet side; then, after the compressor operates for a period of time, make the refrigerant on the fault indoor unit side flow to the compressor and the non-fault indoor unit; then, close the stop valve on the refrigerant outlet side of the fault indoor unit, so that the refrigerant is locked in the outdoor unit and the non-fault indoor unit.

[0134] In addition, for the one-to-many air conditioner, after the refrigerant is recovered to the outdoor unit and the non-fault indoor unit, the refrigerant amount flowing through the non-fault indoor unit will increase, so the refrigerating capacity or the heating capacity of the non-fault indoor unit will change, thereby affecting the indoor environment temperature, for this, the embodiment of the present application will also perform the following measures: reduce the operating frequency of the compressor, or reduce the fan speed of the non-fault indoor unit, so that the temperature of the indoor environment where the non-fault indoor unit is located remains stable.

[0135] Based on the air conditioner control method of each of the above embodiments, the following proposes multiple overall embodiments of the air conditioner control method of the present application.

[0136] In an embodiment, the general flow of the refrigerant over-range detection scheme of the embodiment of the present application is as follows: first, obtain the current concentration parameter of the refrigerant sensor; then, obtain the sensor fault flag of the refrigerant sensor; then, if an over-range fault occurs, prompt the fault and the concentration value, and if no over-range fault occurs, judge whether the concentration exceeds the standard according to the local laws and regulations. The specific flow can be seen in FIG. 5 and FIG. 6.

[0137] As shown in FIG. 5, FIG. 5 is a flowchart of the overall process of refrigerant over-range detection in the air conditioner control method according to an embodiment of the present application, which includes but is not limited to the following steps:

[0138] Step S501, start-up;

[0139] Step S502, obtain the concentration parameter of the refrigerant sensor;

[0140] Step S503, obtain the over-range fault;

[0141] Step S504, determine whether there is an over-range fault, if yes, execute step S505, otherwise execute step S508;

[0142] Step S505, determine whether the refrigerant concentration is greater than or equal to 0%, if yes, execute step S506, otherwise execute step S507;

[0143] Step S506, determine that the air conditioner has an over-range fault and refrigerant leakage;

[0144] Step S507, determine that the air conditioner has an over-range fault;

[0145] Step S508, determine whether the refrigerant concentration is greater than 25%, if yes, execute step S509, otherwise execute step S510;

[0146] Step S509, determine that the air conditioner has a serious refrigerant leakage;

[0147] Step S510, determine whether the refrigerant concentration is greater than 10%, if yes, execute step S511, otherwise execute step S512;

[0148] Step S511, determine that the air conditioner has a general refrigerant leakage;

[0149] Step S512, determine whether the refrigerant concentration is greater than 7%, if yes, execute step S502, otherwise execute step S513;

[0150] Step S513, determine whether there is other fault, if yes, execute step S514, otherwise execute step S515;

[0151] Step S514, prompt the fault;

[0152] Step S515, fault recovery.

[0153] Specifically, after power-on, the main control circuit board establishes communication with the refrigerant sensor, the main control program acquires the concentration parameter of the refrigerant sensor, and acquires the refrigerant sensor fault flag, and judges the fault flag. If an over-range fault occurs, the main control circuit board judges the current concentration, and if the concentration is greater than or equal to 0, it prompts the over-range and leakage fault, otherwise it only prompts the over-range fault. If no over-range fault occurs, the main control circuit board judges the current concentration, and if the concentration is greater than a first preset threshold such as 25%, it immediately reports a refrigerant serious leakage fault; if the concentration is greater than a second preset threshold such as 10%, it reports a refrigerant leakage fault after a certain time; if the concentration is lower than a third preset threshold such as 7% and lasts for a certain time, the main control fault is cleared.

[0154] As shown in FIG. 6, FIG. 6 is a whole flow chart of the refrigerant fault execution action in the air conditioner control method provided by an embodiment of the application. For a certain indoor unit, the flow includes but is not limited to the following steps:

[0155] Step S601, start;

[0156] Step S602, judge whether there is a refrigerant fault in other indoor units, if yes, execute step S603, otherwise execute step S604;

[0157] Step S603, prompt the fault;

[0158] Step S604, judge whether there is a fault in the refrigerant sensor, if yes, execute step S605, otherwise execute step S606;

[0159] Step S605, prompt the fault;

[0160] Step S606, judge whether there is a leakage fault or an over-range and leakage fault, if yes, execute step S607, otherwise execute step S611;

[0161] Step S607, prompt the fault;

[0162] Step S608, open the indoor unit fan to the maximum;

[0163] Step S609, alarm with the buzzer;

[0164] Step S610, shield the control signal;

[0165] Step S611, judge whether there is an over-range fault, if yes, execute step S612, otherwise execute step S601;

[0166] Step S612, prompt the fault;

[0167] Step S613, send the fault to the outdoor unit.

[0168] Specifically, when the refrigerant leakage or out-of-range fault occurs, the main control circuit board of the indoor unit performs the following actions: when the sensor fault or other outdoor unit fault occurs, only the fault is prompted; when the refrigerant leakage or out-of-range and leakage fault occur, the fault code is prompted, the fan is started at the maximum speed, and the buzzer is sounded and lasts for a period of time; wherein, all sensor faults of the local indoor unit are sent to the outdoor unit. When the outdoor unit is a one-to-one outdoor unit, the outdoor unit performs a stop action; when the outdoor unit is a one-to-many outdoor unit, the outdoor unit sends the fault to other indoor units and performs a refrigerant recovery action.

[0169] In addition, it should be noted that the calculation and judgment of the out-of-range are as follows:

[0170] Under certain environmental conditions, the voltage measurement value x of the electrochemical sensor and the sample concentration y have a functional relationship, which is usually a unary function, which can be expressed as y=kx+b, wherein k and b are constants, which are calculated by calibrating a plurality of samples with known concentrations. After obtaining k and b, when the sample with unknown concentration is introduced, the concentration y of the sample can be obtained by y=kx+b. If the actual concentration of the sample to be measured is outside the concentration range of the calibration sample, the measurement result is unreliable.

[0171] In addition, if the measurement environment is inconsistent with the calibration environment, the values of k and b are different, so the actual measurement value y is a multivariate function relationship of the sample concentration and the environmental variables, such as y=f(x, t, rh, p, …), wherein x represents the measurement voltage, t represents the temperature, rh represents the relative humidity, p represents the atmospheric pressure, and the like.

[0172] Therefore, the measurement out-of-range mainly comes from the above two points: reason 1. The concentration of the sample to be measured is outside the concentration range of the calibration sample; reason 2. The environmental variables of the measurement are greatly different from the environmental variables of the calibration.

[0173] For the out-of-range caused by reason 1, a segmented function can be used for optimization to expand the range of the range, but it can never cover all concentration ranges.

[0174] For the out-of-range caused by reason 2, the following methods can be used to improve it: 1) using constant temperature, constant humidity and constant pressure to ensure that the environmental variables are as consistent as possible; 2) using multiple linear regression to obtain a multivariate function relationship of the sample concentration and the environmental variables. For example, we can measure the parameters of the system n times to obtain n sets of data [yi, xi1, xi2, xi3, …, xim], i is the measurement number, and m is the number of variables. Assuming that the variables are linearly related, the n sets of data can be expressed as: b1*xi1+b2*xi2+b3*xi3+…+bn*xim=yi, or Y=XB, wherein,

[0175] Y=[y1,y2,y3……yn]’ represents the concentration of the standard substance used for n times of testing;

[0176] B=[b1,b2,b3,……bm]’ represents the weight coefficient of each variable;

[0177] X=[x11,x12,x13,……x1m,

[0178] x21,x22,x23,……x2m,

[0179] …

[0180] xn1,xn2,xn3,……xnm] represents the measurement value of m variables in n measurements;

[0181] B=(X’X) -1 X’Y, in subsequent calculation, the value of m variables is multiplied by the weight coefficient B and accumulated, so that the concentration y of the measured substance can be obtained. However, no matter it is mode 1) or mode 2), or the combination of the two, the problem of over-range cannot be completely solved.

[0182] Since the problem of over-range cannot be completely solved, it is necessary to judge the over-range. The specific logic is as follows: first, determine the influence of the environmental variable on the measurement result by experiment, when the measurement result deviates from the actual concentration by a certain value when the environmental variable is changed, mark the value of the environmental variable; in addition, judge whether the environmental variable is in a reasonable range during measurement, if the current environmental variable is in a reasonable range, judge whether the calculated concentration result exceeds the calibration range, if so, it is judged as over-range; if the environmental variable is in an unreasonable range, it is directly judged as over-range.

[0183] Based on the air conditioner control method of each of the above embodiments, the following respectively proposes each embodiment of the controller, air conditioner and computer readable storage medium of the application.

[0184] As shown in FIG. 7, FIG. 7 is a structural schematic diagram of a controller for executing the air conditioner control method according to an embodiment of the application. The controller 110 implemented by the application comprises a processor 111, a memory 112 and a computer program stored in the memory 112 and executable on the processor 111, wherein one processor 111 and one memory 112 are taken as an example in FIG. 7, in addition, the controller 110 can be arranged on the main control circuit board shown in FIG. 1.

[0185] The processor 111 and the memory 112 can be connected through a bus or other means, and a connection through a bus is taken as an example in FIG. 7.

[0186] The memory 112, as a non-transitory computer readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 112 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory 112 can optionally include a memory 112 that is remotely arranged relative to the processor 111, and these remote memories 112 can be connected to the controller 110 through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0187] Those skilled in the art can understand that the device structure shown in FIG. 7 does not constitute a limitation on the controller 110, and can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0188] In the controller 110 shown in FIG. 7, the processor 111 can be used to invoke the air conditioner control program stored in the memory 112, thereby implementing the air conditioner control method described above. Specifically, the non-transitory software programs and instructions required to implement the air conditioner control method of the above-described embodiments are stored in the memory 112, and when executed by the processor 111, the air conditioner control method of the above-described embodiments is executed.

[0189] It is worth noting that since the controller 110 of the embodiments of the present application can execute the air conditioner control method of any of the above-described embodiments, the specific implementation and technical effects of the controller 110 of the embodiments of the present application can be referred to the specific implementation and technical effects of the air conditioner control method of any of the above-described embodiments.

[0190] In addition, one embodiment of the present application also provides an air conditioner comprising the controller of the above-described embodiments.

[0191] It is worth noting that since the air conditioner of the embodiments of the present application comprises the controller of the above-described embodiments, and the controller of the above-described embodiments can execute the air conditioner control method of any of the above-described embodiments, the specific implementation and technical effects of the air conditioner of the embodiments of the present application can be referred to the specific implementation and technical effects of the air conditioner control method of any of the above-described embodiments.

[0192] In addition, one embodiment of the present application also provides a computer readable storage medium, which stores computer executable instructions for executing the air conditioner control method described above. Exemplarily, the method steps in FIGS. 2 to 6 described above are executed.

[0193] It is worth noting that since the computer readable storage medium of the embodiments of the present application can execute the air conditioner control method of any one of the above embodiments, the specific implementation and technical effects of the computer readable storage medium of the embodiments of the present application can refer to the specific implementation and technical effects of the air conditioner control method of any one of the above embodiments.

[0194] In addition, one embodiment of the present application also provides a computer program product, comprising computer programs or computer instructions, the computer programs or computer instructions are stored in a computer readable storage medium, the processor of a computer device reads the computer programs or computer instructions from the computer readable storage medium, and the processor executes the computer programs or computer instructions, so that the computer device executes the above-mentioned air conditioner control method. Exemplarily, the method steps in FIG. 2 to FIG. 6 described above are executed.

[0195] It is worth noting that since the computer program product of the embodiments of the present application can execute the air conditioner control method of any one of the above embodiments, the specific implementation and technical effects of the computer program product of the embodiments of the present application can refer to the specific implementation and technical effects of the air conditioner control method of any one of the above embodiments.

[0196] Those of ordinary skill in the art will understand that all or some of the steps in the above disclosed method, system can be implemented as software, firmware, hardware and their appropriate combinations. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on computer readable media, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as known to those of ordinary skill in the art, communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transport mechanisms, and can include any information delivery medium.

[0197] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A method for controlling an air conditioner, wherein: The air conditioner includes a refrigerant sensor, and the method includes: Obtaining the current refrigerant concentration value and fault flag information fed back by the refrigerant sensor; and When the fault flag information is a sensor over-range fault, the refrigerant leakage state of the air conditioner is determined according to the current refrigerant concentration value.

2. The air conditioner control method according to claim 1, wherein: Determining the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value includes at least one of the following: When the current refrigerant concentration value is greater than or equal to a first concentration threshold, determining that there is a refrigerant leak in the air conditioner; When the current refrigerant concentration value is less than a first concentration threshold, it is determined that there is no refrigerant leakage in the air conditioner.

3. The air conditioner control method according to claim 1 or 2, wherein: After obtaining the current refrigerant concentration value and fault sign information fed back by the refrigerant sensor, the air conditioner control method further includes: When the fault flag information is a non-sensor over-range fault, the refrigerant leakage state of the air conditioner is determined according to the current refrigerant concentration value and a preset concentration threshold.

4. The air conditioner control method according to claim 3, wherein: The determining of the refrigerant leakage state of the air conditioner according to the current refrigerant concentration value and a preset concentration threshold value includes at least one of the following: When the current refrigerant concentration value is greater than a second concentration threshold, determining that the refrigerant leakage state of the air conditioner is a serious leakage state; When the current refrigerant concentration value is greater than a third concentration threshold and less than or equal to a second concentration threshold, determining that the refrigerant leakage state of the air conditioner is a general leakage state, wherein the third concentration threshold is less than the second concentration threshold; When the current refrigerant concentration value is greater than a fourth concentration threshold and less than or equal to a third concentration threshold, determining that there is a refrigerant leak in the air conditioner, wherein the fourth concentration threshold is less than the third concentration threshold; When the current refrigerant concentration value is less than or equal to a fourth concentration threshold, it is determined that there is no refrigerant leakage in the air conditioner.

5. The air conditioner control method according to any one of claims 1 to 4, wherein: The sensor over-range fault is determined by the following steps: Obtaining environmental parameters; and When the environmental parameter is within a preset reasonable range, and the current refrigerant concentration value is outside the calibration range of the refrigerant sensor, it is determined that the refrigerant sensor has a sensor over-range fault.

6. The air conditioner control method according to claim 5, wherein: After determining that the refrigerant sensor has a sensor over-range fault, the air conditioner control method further includes: Obtaining a voltage measurement value fed back by the refrigerant sensor, inputting the voltage measurement value into a preset piecewise function model, and outputting an optimized refrigerant concentration value through the piecewise function model; In which, the piecewise function model includes multiple linear functions, each of the linear functions includes a first input variable, a preset coefficient and a preset constant, the first input variable is used to be assigned the voltage measurement value, the sum of the product value of the first input variable and the preset coefficient and the preset constant is the optimized refrigerant concentration value, and the first input variable in one linear function corresponds to a voltage measurement value interval.

7. The air conditioner control method according to any one of claims 1 to 6, wherein: The sensor over-range fault is determined by the following steps: Obtaining environmental parameters; and When the environmental parameter is outside a preset reasonable range, it is determined that the refrigerant sensor has a sensor over-range fault.

8. The air conditioner control method according to claim 7, wherein: After determining that the refrigerant sensor has a sensor over-range fault, the air conditioner control method further includes: Obtaining a voltage measurement value fed back by the refrigerant sensor, inputting the environmental parameter and the voltage measurement value into a preset multivariate function, and outputting an optimized refrigerant concentration value through the multivariate function; In which, the multivariate function includes a second input variable, a third input variable, an environmental weight parameter and a voltage weight parameter, the second input variable is used to be assigned the voltage measurement value, the third input variable is used to be assigned the environmental parameter, and the sum of the product value of the second input variable and the environmental weight parameter and the product value of the third input variable and the voltage weight parameter is the optimized refrigerant concentration value.

9. The air conditioner control method according to any one of claims 5 to 8, wherein: The environmental parameters include at least one of the following: ambient temperature, ambient humidity, light intensity, and ambient air pressure.

10. The air conditioner control method according to any one of claims 11 to 9, wherein: In the case where there is a refrigerant leak in the air conditioner or the fault flag information indicates a sensor over-range fault, the air conditioner control method further includes at least one of the following: When the air conditioner is a one-to-one air conditioner, refrigerant is recovered to the outdoor unit and the outdoor unit is controlled to shut down; When the air conditioner is a one-to-many air conditioner, fault information is sent to the non-faulty indoor unit through the outdoor unit, and the refrigerant is recovered to the outdoor unit and the non-faulty indoor unit.

11. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the air conditioner control method according to any one of claims 1 to 10 when executing the computer program.

12. An air conditioner comprising the controller according to claim 11.

13. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the air conditioner control method according to any one of claims 1 to 10.

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