Refrigerant deficiency detection method for air conditioner, air conditioner and computer readable storage medium

Abstract

The application is suitable for the technical field of intelligent control, and provides a refrigerant absence detection method of an air conditioner, the air conditioner and a computer readable storage medium. The air conditioner comprises a shell, an evaporator and a compressor, and the shell is provided with an air outlet corresponding to the evaporator. The refrigerant absence detection method of the air conditioner comprises the following steps: acquiring a current air outlet temperature of the air outlet; acquiring an operating condition of the air conditioner, and determining a reference air outlet temperature according to the operating condition; calculating a first difference value between the current air outlet temperature and the reference air outlet temperature; if the absolute value of the first difference value is greater than a first difference value threshold, acquiring a current exhaust temperature of an exhaust port of the compressor; and determining a refrigerant absence degree of the air conditioner according to the current exhaust temperature. The embodiment of the application can accurately detect the refrigerant absence condition of the air conditioner.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent detection, and particularly relates to a refrigerant absence detection method for an air conditioner, the air conditioner and a computer readable storage medium. BACKGROUND

[0002] An air conditioner is an air conditioner for adjusting and controlling parameters such as temperature, humidity and flow rate of ambient air. Refrigerant, also known as refrigerant or snow, is a working medium for completing a thermodynamic cycle in the air conditioner. During use of the air conditioner, the internal pipeline of the air conditioner may be accidentally impacted, the air conditioner may be used for a long time, or stress generated when the air conditioner is placed may cause refrigerant leakage. After refrigerant leakage, the air conditioner cannot effectively exchange heat due to lack of refrigerant, and a problem of poor refrigeration (heating) effect occurs. Therefore, an effective refrigerant absence detection method is needed to accurately evaluate the refrigerant absence condition of the air conditioner. SUMMARY

[0003] The embodiments of the application provide a refrigerant absence detection method for an air conditioner, the air conditioner and a computer readable storage medium, which can accurately evaluate the refrigerant absence condition of the air conditioner.

[0004] The first aspect of the embodiments of the application provides a refrigerant absence detection method for an air conditioner, the air conditioner comprising a shell, an evaporator and a compressor, and the shell being provided with an air outlet corresponding to the evaporator; the refrigerant absence detection method for the air conditioner comprising: acquiring a current air outlet temperature of the air outlet; acquiring an operating condition of the air conditioner, and determining a reference air outlet temperature according to the operating condition; calculating a first difference value between the current air outlet temperature and the reference air outlet temperature; if an absolute value of the first difference value is greater than a first difference value threshold, acquiring a current exhaust temperature of an exhaust port of the compressor; and determining a refrigerant absence degree of the air conditioner according to the current exhaust temperature.

[0005] The second aspect of the embodiments of the application provides a refrigerant absence detection device for an air conditioner, the air conditioner comprising a shell, an evaporator and a compressor, and the shell being provided with an air outlet corresponding to the evaporator; the refrigerant absence detection device for the air conditioner comprising: a first acquisition unit, configured to acquire a current air outlet temperature of the air outlet; a determination unit, configured to acquire an operating condition of the air conditioner, and determine a reference air outlet temperature according to the operating condition; a calculation unit, configured to calculate a first difference value between the current air outlet temperature and the reference air outlet temperature; a second acquisition unit, configured to acquire a current exhaust temperature of an exhaust port of the compressor if an absolute value of the first difference value is greater than a first difference value threshold; and a detection unit, configured to determine a refrigerant absence degree of the air conditioner according to the current exhaust temperature.

[0006] The third aspect of the embodiments of the present application provides an air conditioner, which comprises a shell, an evaporator, a compressor, a memory, at least one processor, and a computer program stored in the memory and capable of running on the at least one processor. The shell is provided with an air outlet corresponding to the evaporator. The at least one processor implements the steps of the refrigerant deficiency detection method of the air conditioner according to the first aspect when the computer program is executed.

[0007] The fourth aspect of the embodiments of the present application provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and capable of running on the processor. The processor implements the steps of the refrigerant deficiency detection method of the air conditioner when the computer program is executed.

[0008] The fifth aspect of the embodiments of the present application provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the steps of the refrigerant deficiency detection method of the air conditioner.

[0009] The sixth aspect of the embodiments of the present application provides a computer program product, which, when running on an air conditioner or an electronic device, causes the air conditioner or the electronic device to execute the refrigerant deficiency detection method of the air conditioner.

[0010] In the embodiments of the present application, a first difference between a current air outlet temperature of the air outlet of the evaporator and a reference air outlet temperature can be calculated, and an absolute value of the first difference is compared with a first difference threshold. When the absolute value of the first difference is greater than the first difference threshold, it indicates that the current air outlet temperature deviates greatly from the reference air outlet temperature, and the air conditioner has a refrigerant deficiency fault.

[0011] Then, a current discharge temperature of the discharge port of the compressor can be obtained. Since the discharge temperature of the discharge port of the compressor has a relatively obvious difference under different refrigerant deficiency conditions, the degree of refrigerant deficiency of the air conditioner can be more accurately evaluated according to the size of the current discharge temperature of the discharge port of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 is a flowchart of the refrigerant deficiency detection method of the air conditioner provided by the embodiments of the present application;

[0014] Figure 2is a specific structure schematic diagram of an air conditioner provided by an embodiment of the present application.

[0015] Figure 3 is a first specific implementation flowchart of step S105 provided by an embodiment of the present application.

[0016] Figure 4 is a second specific implementation flowchart of step S105 provided by an embodiment of the present application.

[0017] Figure 5 is a flowchart of an air conditioner autonomous refrigerant absence detection provided by an embodiment of the present application.

[0018] Figure 6 is a structure schematic diagram of a refrigerant absence detection device of an air conditioner provided by an embodiment of the present application.

[0019] Figure 7 is a structure schematic diagram of an air conditioner provided by an embodiment of the present application.

[0020] Figure 8 is a structure schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] During use of the air conditioner, the internal pipeline of the air conditioner may be accidentally impacted, the air conditioner may be used for a long time, or stress generated when the air conditioner is placed may all cause refrigerant leakage. After refrigerant leakage, the air conditioner cannot effectively exchange heat due to lack of refrigerant, and a problem of poor refrigeration (heating) effect occurs.

[0023] In view of this, an embodiment of the present application proposes a refrigerant absence detection method of an air conditioner, which can detect refrigerant absence of the air conditioner through an outlet air temperature of an outlet of an evaporator and a current discharge temperature of a discharge port of a compressor, and can more accurately evaluate the refrigerant absence degree of the air conditioner.

[0024] In order to illustrate the technical solutions of the present application, specific embodiments are described below.

[0025] Figure 1 An implementation flowchart of a refrigerant absence detection method of an air conditioner provided by an embodiment of the present application is shown, and the method can be applied to a situation in which refrigerant absence detection deviation of the air conditioner needs to be reduced.

[0026] In embodiments of the present application, the above-mentioned air conditioner can include a casing, an evaporator, and a compressor. The evaporator can be used to convert refrigerant from a liquid state to a gaseous state, thereby absorbing heat in the air. The casing can be provided with an air outlet corresponding to the evaporator for the exhaust air of the evaporator. The compressor can be used to compress the gaseous refrigerant into high-pressure refrigerant gas.

[0027] Specifically, Figure 2 A structural schematic diagram of the air conditioner provided by the present application is shown. The air conditioner can include a condenser, a compressor, an evaporator, and an electronic expansion valve. The compressor is connected to the evaporator and the condenser, respectively, and the electronic expansion valve is connected to the evaporator and the condenser, respectively. The gaseous refrigerant formed by heat exchange in the evaporator can flow into the compressor. The compressor can be used to compress the gaseous refrigerant into high-pressure refrigerant gas and press it into the condenser. After heat exchange with air at the condenser, the high-pressure refrigerant gas can be throttled and depressurized by the electronic expansion valve and flow back to the evaporator. Thus, a system cycle of "condenser-electronic expansion valve-evaporator-compressor" in the air conditioner is formed.

[0028] In some embodiments, as shown in Figure 2 The condenser, the compressor, and the evaporator can be connected through a four-way valve. The four-way valve can be used to change the flow direction of the gaseous refrigerant in the above-mentioned system cycle, so that the above-mentioned air conditioner can switch between cooling mode and heating mode.

[0029] In some embodiments, as shown in Figure 2 The condenser side can be provided with a condenser fan for discharging gas for the condenser. The evaporator side can be provided with an evaporator fan for discharging gas for the evaporator.

[0030] In some embodiments, as shown in Figure 2 A filter can be provided between the condenser and the electronic expansion valve, and between the electronic expansion valve and the evaporator. The filter can be used to absorb moisture and impurities in the pipeline to avoid pipeline cold blockage or pipeline dirty blockage in the above-mentioned system cycle.

[0031] In some embodiments, as shown in Figure 2 A process pipe can also be provided between the condenser and the electronic expansion valve, which can be used to charge refrigerant.

[0032] In some embodiments, as shown in Figure 2 The three-way valve and the water pump can be used to control the circulation flow of cooling water, and the water pump can spray cooling water on the surface of the evaporator / condenser through the corresponding pipeline to cool the evaporator / condenser.

[0033] In order to facilitate the control of the air conditioner, in some embodiments, as shown in Figure 2As shown, the condenser side and the evaporator side can be provided with an ambient temperature sensor. The ambient temperature sensor can be provided at the air inlet of the condenser side and the evaporator side to detect the real-time ambient temperature. Among them, when the above air conditioner is a split air conditioner, the ambient temperature sensor of the condenser side can be used to detect the ambient temperature outside; the ambient temperature sensor of the evaporator side can be used to detect the ambient temperature inside. The exhaust pipe and the intake pipe of the compressor can be respectively provided with an exhaust temperature sensor and a suction temperature sensor, respectively, for detecting the real-time exhaust temperature and the real-time suction temperature. The pipeline of the condenser and the evaporator can also be provided with a pipeline temperature sensor for detecting the real-time pipeline temperature. The water pump can be provided with a water level sensor for detecting the water level of the cooling water.

[0034] In some embodiments, the above refrigerant can be a fluorine-containing compound, or it can also be a fluorine-free compound. For example, the above refrigerant can be R410A (mainly composed of hydrogen, fluorine and carbon elements), propane (also known as R290), difluoromethane (also known as R32), etc. The present application does not limit this.

[0035] It should be understood that, Figure 2 It is only a schematic diagram of the internal structure of the air conditioner. In actual application, the above air conditioner can include more or fewer components, and the present application does not limit this.

[0036] And the above air conditioner can be a built-in air conditioner or a split air conditioner, and the present application does not limit this. In a built-in air conditioner, the components such as the compressor and the evaporator that make up the air conditioner are arranged in a whole machine shell. In some scenarios, the built-in air conditioner can be used as a mobile air conditioner.

[0037] It should be noted that, Figure 1 The control method shown can be executed by a processor, which can be integrated in the air conditioner or on a separate electronic device. The electronic device can be a computer, a smart phone, or a special instrument for refrigerant absence detection, etc. When the processor is integrated in the air conditioner, the air conditioner can complete the refrigerant absence detection Figure 1 The method shown can be used to complete the refrigerant absence detection autonomously. The present application does not limit this.

[0038] Specifically, the refrigerant absence detection method of the above air conditioner can include the following steps S101 to S105.

[0039] Step S101, obtain the current outlet air temperature of the air outlet.

[0040] The current air outlet temperature is the real-time temperature at the air outlet of the evaporator. The processor can obtain the current air outlet temperature through a temperature sensor arranged on the side of the air outlet of the evaporator. Of course, the current air outlet temperature can also be obtained in other ways, for example, a user places a temperature probe at the air outlet of the air conditioner, and inputs after the user checks the temperature of the temperature probe. The present application does not limit this.

[0041] In step S102, the operating condition of the air conditioner is obtained, and the reference air outlet temperature is determined according to the operating condition.

[0042] The reference air outlet temperature is the air outlet temperature at the air outlet of the evaporator when the air conditioner is normally running (i.e., the degree of refrigerant loss is within the allowable range). The reference air outlet temperature can be used to compare with the current air outlet temperature to determine whether the air conditioner has a refrigerant loss fault.

[0043] The operating condition of the air conditioner is related to the environment in which the air conditioner is located and the running mode inside the air conditioner. Specifically, the operating condition of the air conditioner can include, but is not limited to, the ambient temperature, the ambient humidity, the running mode (cooling mode / heating mode), the running power, etc. when the air conditioner is running. Under different operating conditions, the reference air outlet temperature at the air outlet of the evaporator when the air conditioner is normally running is different, so the processor needs to obtain the operating condition of the air conditioner and determine the corresponding reference air outlet temperature according to the operating condition.

[0044] In step S103, the first difference between the current air outlet temperature and the reference air outlet temperature is calculated.

[0045] The first difference refers to the temperature difference between the current air outlet temperature and the reference air outlet temperature, which can represent the deviation between the current air outlet temperature and the reference air outlet temperature, and further represent whether the air conditioner has a refrigerant loss fault.

[0046] In step S104, if the absolute value of the first difference is greater than the first difference threshold, the current exhaust temperature of the exhaust port of the compressor is obtained.

[0047] The first difference threshold is the maximum allowable deviation between the current air outlet temperature and the reference air outlet temperature.

[0048] In the embodiments of the present application, if the absolute value of the first difference between the current air outlet temperature and the reference air outlet temperature is less than or equal to the first difference threshold, it means that the deviation between the current air outlet temperature and the reference air outlet temperature is within the allowable range, indicating that the current running state of the air conditioner is similar to the normal running state of the air conditioner, and the air conditioner does not have a refrigerant loss fault.

[0049] If the absolute value of the first difference value is greater than the first difference threshold value, it indicates that the deviation between the current outlet air temperature and the reference outlet air temperature is outside the allowable range, which means that the current running state of the air conditioner is significantly different from the normal running state of the air conditioner, and the air conditioner has a refrigerant loss fault.

[0050] When the air conditioner has a refrigerant loss fault, the exhaust temperature of the compressor exhaust port is significantly different under different refrigerant loss conditions. Therefore, to evaluate the refrigerant loss degree of the air conditioner, the processor can obtain the current exhaust temperature of the compressor exhaust port.

[0051] The current exhaust temperature is the real-time temperature at the exhaust port of the compressor, which can be obtained by a temperature sensor arranged on one side of the exhaust port. Of course, the current exhaust temperature can also be obtained in other ways, such as input by the user after checking the relevant temperature, which is not limited in the present application.

[0052] In step S105, the refrigerant loss degree of the air conditioner is determined according to the current exhaust temperature.

[0053] The refrigerant loss degree can represent the loss amount of the refrigerant of the air conditioner and reflect the current refrigeration (heating) effect of the air conditioner.

[0054] As an example, since the exhaust temperature of the exhaust port is different under different refrigerant loss degrees, the corresponding relationship (such as a functional relationship) between the exhaust temperature and the refrigerant loss degree can be calibrated in advance, and the current refrigerant loss degree of the air conditioner can be determined based on the corresponding relationship and the current exhaust temperature. As another example, the exhaust temperature of the air conditioner under different refrigerant loss degrees can be obtained, and the current exhaust temperature can be compared with the exhaust temperature under different refrigerant loss degrees to determine the refrigerant loss degree of the air conditioner. The present application is not limited in this regard.

[0055] In some embodiments, based on the refrigerant loss degree of the air conditioner, the processor can execute a preset control strategy. For example, the refrigerant loss warning can be performed when the air conditioner has a small amount of refrigerant loss, the air conditioner can be turned off when the air conditioner has no refrigerant, and the like.

[0056] In the embodiments of the present application, the first difference value of the current outlet air temperature and the reference outlet air temperature of the evaporator outlet can be calculated, and the absolute value of the first difference value can be compared with the first difference threshold value. When the absolute value of the first difference value is greater than the first difference threshold value, it indicates that the current outlet air temperature and the reference outlet air temperature have a large deviation, and the air conditioner has a refrigerant loss fault. Then, the current exhaust temperature of the compressor exhaust port can be obtained. Since the exhaust temperature of the compressor exhaust port is significantly different under different refrigerant loss conditions, the refrigerant loss degree of the air conditioner can be more accurately evaluated according to the size of the current exhaust temperature of the compressor exhaust port.

[0057] The refrigerant deficiency detection method shown in the specific embodiments will be described below. Figure 1

[0058] In some embodiments, if the air conditioner is in the heating mode, the outflow temperature and the outflow humidity can be combined to determine whether the air conditioner has a refrigerant deficiency.

[0059] At this time, the above steps S101-S103 can include: obtaining the current outflow temperature and humidity of the air outlet, obtaining the operating condition of the air conditioner, determining the reference outflow temperature according to the operating condition, and calculating the first difference between the current outflow temperature and humidity and the reference outflow temperature and humidity.

[0060] If the air conditioner is in the cooling mode, the processor can directly calculate the first difference between the current outflow temperature and the reference outflow temperature.

[0061] Specifically, when determining the reference outflow temperature according to the operating condition, the processor can obtain the reference outflow temperature or humidity corresponding to the operating condition stored in the database according to the operating condition. The database can store reference outflow temperatures or humidities under multiple operating conditions. These values can be set by staff according to experience values, or obtained by testing the air conditioner under each operating condition in advance.

[0062] Correspondingly, in step S104, the processor can obtain the current discharge temperature of the discharge port of the compressor when the absolute value of the first difference is greater than the first difference threshold.

[0063] Considering that other abnormal problems of the air conditioner can also cause the current outflow temperature to deviate from the reference outflow temperature, in order to ensure the accuracy of the refrigerant deficiency fault judgment, in some embodiments, before obtaining the current discharge temperature, the processor can also obtain the current operating power of the air conditioner and the reference power range corresponding to the current operating condition of the air conditioner.

[0064] Correspondingly, the above-mentioned obtaining the current discharge temperature of the discharge port of the compressor can include: if the current operating power is within the reference power range, obtaining the current discharge temperature.

[0065] Specifically, the current operating power, i.e., the real-time operating power of the air conditioner, can be the sum of the operating power of the evaporative fan, the power of the condensing fan, and the power of the compressor, which can be measured by the power detection controller inside the air conditioner.

[0066] ​The reference power range refers to an interval of power when the air conditioner does not have a refrigerant loss fault. Under different operating conditions and different degrees of refrigerant loss, the operating power of the evaporative fan, the condensing fan, and the compressor has certain differences. Therefore, the processor needs to obtain the reference power range corresponding to the current operating condition of the air conditioner according to the current operating condition of the air conditioner.

[0067] In some embodiments, the lower limit of the reference power range can be set as the operating power when there is no refrigerant under the corresponding operating condition, and the upper limit can be set as the operating power when the refrigerant amount is 100% under the corresponding operating condition. For example, assuming that when the ambient temperature is 35 degrees Celsius and the ambient humidity is 24% RH, the operating power is 180 W when there is no refrigerant under the maximum output mode of the air conditioner, and the operating power is 550 W when the refrigerant amount is 100%, the reference power range corresponding to the operating condition is [180, 550].

[0068] If the current operating power is outside the reference power range, it indicates that the air conditioner has other abnormal problems other than the refrigerant loss fault. These abnormal problems can cause poor refrigeration (heating) effect, thereby affecting the accuracy of the refrigerant loss detection. At this time, the processor can perform abnormal processing, such as performing abnormal alarm, restarting the air conditioner, and the like.

[0069] If the current operating power is within the reference power range, the air conditioner does not have other abnormal problems that cause poor refrigeration (heating) effect other than the refrigerant loss fault, and the processor can obtain the current discharge temperature of the discharge port of the compressor to determine the degree of refrigerant loss of the air conditioner.

[0070] Specifically, in some embodiments, as shown in FIG. 3, the above determination of the degree of refrigerant loss of the air conditioner can include the following steps S301 to S303. Figure 3

[0071] Step S301: Obtain the reference discharge temperature corresponding to the operating condition.

[0072] In the embodiments of the present application, the reference discharge temperature is the discharge temperature at the discharge port of the compressor when the air conditioner is normally running (i.e., the degree of refrigerant loss is within the allowable range). The reference discharge temperature can be used for comparison with the current discharge temperature to determine the degree of refrigerant loss of the air conditioner.

[0073] Among them, the reference discharge temperature corresponding to different operating conditions can also be set by workers according to empirical values, or can be obtained by testing the air conditioner in advance under the corresponding operating condition.

[0074] Step S302: If the current discharge temperature is greater than the reference discharge temperature, calculate a second difference between the current discharge temperature and the reference discharge temperature.

[0075] ​The second difference value is a temperature difference between the current exhaust temperature and the reference exhaust temperature.

[0076] In step S303, if the absolute value of the second difference value is greater than the second difference value threshold, it is determined that the air conditioner is in the first refrigerant loss state.

[0077] The second difference value threshold is used to determine whether the exhaust temperature of the air conditioner rises due to refrigerant loss, and the specific value can be set according to an empirical value.

[0078] In the embodiments of the present application, the first refrigerant loss state can be understood as a state in which the air conditioner partially loses refrigerant. Specifically, when the air conditioner is in the first refrigerant loss state, the compressor is not running at full load, and the operating power of the compressor will be less than the operating power when there is no loss of refrigerant. However, at the same compressor speed, the amount of heat generated by the compressor winding is constant, and the amount of heat exchange fluid is reduced. According to the law of conservation of energy, the temperature difference during heat exchange will increase, that is, the exhaust temperature will rise. In view of this, if the current exhaust temperature is greater than the reference exhaust temperature, the processor can calculate the second difference value between the current exhaust temperature and the reference exhaust temperature. By comparing the absolute value of the second difference value with the second difference value threshold, if the absolute value of the second difference value is greater than the second difference value threshold, it indicates that the exhaust temperature rises due to the partial loss of refrigerant. Therefore, the processor can determine that the air conditioner is in the first refrigerant loss state.

[0079] If the absolute value of the second difference value is less than or equal to the second difference value threshold, it indicates that the exhaust temperature does not rise due to the loss of refrigerant, for example, it rises due to the detection error of the temperature sensor. Therefore, the processor can return to step S101 to re-detect the loss of refrigerant.

[0080] Specifically, the first refrigerant loss state can include a first sub-state and a second sub-state. The refrigerant loss degree of the first sub-state is less than the refrigerant loss degree of the second sub-state.

[0081] The first sub-state can indicate that the amount of refrigerant loss is within an acceptable range, and has little effect on the refrigeration (heating) effect of the air conditioner. At this time, it is difficult for a human to perceive the change in the refrigeration (heating) effect of the air conditioner. The second sub-state indicates that the amount of refrigerant loss exceeds the acceptable range, and the amount of refrigerant loss is large, which seriously affects the refrigeration (heating) effect of the air conditioner.

[0082] Specifically, the above step S303 can include: if the absolute value of the second difference value is greater than the second difference value threshold, and the absolute value of the first difference value is less than the third difference value threshold, it is determined that the air conditioner is in the first sub-state.

[0083] Correspondingly, the above step S303 can also include: if the absolute value of the second difference value is greater than the second difference value threshold, and the absolute value of the first difference value is greater than or equal to the third difference value threshold, it is determined that the air conditioner is in the second sub-state.

[0084] The third difference threshold is greater than the first difference threshold and can be set based on empirical values ​​(e.g., based on the human body's sensitivity to the cooling (heating) effect of air conditioning). For example, the third difference threshold can be set to 1 degree Celsius, 2 degrees Celsius, 3 degrees Celsius, etc.

[0085] As explained above, the magnitude of the first difference indicates the degree of refrigerant deficiency. In the embodiments of this application, a third difference threshold is set, and the first difference is compared with the third difference threshold. If the absolute value of the first difference is less than the third difference threshold, it indicates that the refrigerant deficiency is within an acceptable range, and the processor can determine that the air conditioner is in the first sub-state. If the absolute value of the first difference is greater than or equal to the third difference threshold, it indicates that the refrigerant deficiency exceeds the acceptable range, and the processor can determine that the air conditioner is in the second sub-state and issue a refrigerant deficiency alarm.

[0086] In other implementations, such as Figure 4 As shown, after step S301, if the current exhaust temperature is less than or equal to the reference exhaust temperature, the processor can execute the following steps S401 to S404.

[0087] Step S401: Obtain the ambient temperature of the environment where the air conditioner is located, and the historical exhaust temperature of the compressor's exhaust port.

[0088] The ambient temperature refers to the real-time temperature of the environment where the air conditioner is located. This temperature can be obtained through a temperature sensor or input by the user after viewing the ambient temperature; this application does not impose any restrictions on this. The historical exhaust temperature is the exhaust temperature before a preset time period, which can be 10 seconds, 20 seconds, etc.; this application does not impose any restrictions on this. For example, during the operation of the air conditioner, the processor can periodically acquire the exhaust temperature and record the acquisition time corresponding to each exhaust temperature. Based on the acquisition time, the exhaust temperature before the preset time period at the current moment can be determined from the multiple acquired exhaust temperatures and used as the historical exhaust temperature.

[0089] Step S402: Calculate the third difference between the current exhaust temperature and the historical exhaust temperature.

[0090] Step S403: Calculate the fourth difference between the current exhaust temperature and the ambient temperature.

[0091] Step S404: If the absolute value of the third difference is greater than the fourth difference threshold, and the absolute value of the fourth difference is greater than the fifth difference threshold, then the air conditioner is determined to be in a state of second refrigerant shortage.

[0092] The third difference value is a temperature difference between the current exhaust temperature and the historical exhaust temperature, representing a change value of the exhaust temperature during the air conditioning operation. The fourth difference value is a temperature difference between the current exhaust temperature and the ambient temperature, which can represent the amount of refrigerant working in the compressor.

[0093] In the embodiments of the present application, the refrigerant deficiency degree of the first refrigerant deficiency state is less than the refrigerant deficiency degree of the second refrigerant deficiency state, which can be understood as a state of the air conditioner severely lacking refrigerant.

[0094] Specifically, when the refrigerant in the air conditioner is too little, only a small amount of refrigerant works in the compressor, at this time, the exhaust temperature rises, and there is a certain temperature change between the ambient temperature and the current exhaust temperature. Therefore, if the absolute value of the third difference value is greater than the fourth difference value threshold, and the absolute value of the fourth difference value is greater than the fifth difference value threshold, it indicates that the air conditioner severely lacks refrigerant, at this time, the processor can confirm that the air conditioner is in the second refrigerant deficiency state, and refrigerant deficiency alarm is performed.

[0095] Considering that in the case of complete lack of refrigerant, the heat generated by the compressor winding is constant at the same compressor speed, but there is no refrigerant medium to take away the heat, so that the exhaust temperature cannot be significantly increased, the exhaust temperature change is very small, and is basically consistent with the ambient temperature. Therefore, in another embodiment, after step S403, if the absolute value of the third difference value is less than or equal to the fourth difference value threshold, and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold, it can be determined that the air conditioner is in the third refrigerant deficiency state.

[0096] The refrigerant deficiency degree of the second refrigerant deficiency state is less than the refrigerant deficiency degree of the third refrigerant deficiency state, which can be understood as a state of basically no refrigerant.

[0097] It should be noted that the fourth difference value threshold and the fifth difference value threshold can be set according to actual conditions.

[0098] In order to further confirm whether the air conditioner is without refrigerant, if the absolute value of the third difference value is less than or equal to the fourth difference value threshold, and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold, the processor can obtain the current suction temperature of the suction port of the compressor, and the reference suction temperature of the suction port when the compressor is started for a preset time length. By calculating the fifth difference value between the current suction temperature and the reference suction temperature, if the absolute value of the fifth difference value is greater than the sixth difference value threshold, the processor can determine that the air conditioner is in the third refrigerant deficiency state.

[0099] The current suction temperature is the real-time temperature at the suction port of the compressor. The reference suction temperature is the suction temperature of the suction port when the compressor is started for a preset time length, which can be adjusted according to actual conditions, for example, it can be set to 10s.

[0100] Specifically, when the air conditioner is substantially without refrigerant, the compressor will draw the suction pipe into a vacuum state within a period of time after starting, and the suction temperature will instantaneously decrease. Therefore, if the absolute value of the fifth difference value is greater than the sixth difference value threshold, it indicates that the current suction temperature is much lower than the suction temperature when the compressor is just started, and the processor can confirm that the air conditioner is in the third refrigerant loss state and perform a no refrigerant alarm.

[0101] For ease of understanding, Figure 5 A flowchart of the air conditioner autonomously detecting refrigerant loss is shown. After the air conditioner is started, it can be detected whether the absolute value of the first difference value between the current outlet temperature and the reference outlet temperature is greater than the first difference value threshold. If so, it can be detected whether the current operating power is within the reference power range. If the current operating power is within the reference power range, it can be detected whether the current discharge temperature is greater than the reference discharge temperature.

[0102] When the current discharge temperature is greater than the reference discharge temperature, it can be detected whether the absolute value of the second difference value between the current discharge temperature and the reference discharge temperature is greater than the second difference value threshold. If so, it can be confirmed that the air conditioner is in the first refrigerant loss state, and further confirmed whether the air conditioner is in the first sub-state or the second sub-state according to whether the absolute value of the first difference value is less than the third difference value threshold. When the absolute value of the first difference value is less than the third difference value threshold, it can be determined that the air conditioner is in the first sub-state; when the absolute value of the first difference value is greater than or equal to the third difference value threshold, it can be determined that the air conditioner is in the second sub-state.

[0103] When the current discharge temperature is less than or equal to the reference discharge temperature, it can be detected whether the absolute value of the third difference value between the current discharge temperature and the historical discharge temperature is greater than the fourth difference value threshold. If so, it can be further detected whether the absolute value of the fourth difference value between the current discharge temperature and the ambient temperature is greater than the fifth difference value threshold. If the absolute value of the fourth difference value is greater than the fifth difference value threshold, it can be confirmed that the air conditioner is in the second refrigerant loss state.

[0104] If the absolute value of the third difference value is less than or equal to the fifth difference value threshold, it can be further detected whether the absolute value of the fourth difference value between the current discharge temperature and the ambient temperature is greater than the fifth difference value threshold, and whether the absolute value of the fifth difference value between the current suction temperature and the reference suction temperature is greater than the sixth difference value threshold. When the absolute value of the fourth difference value is greater than the fifth difference value threshold, and the absolute value of the fifth difference value is greater than the sixth difference value threshold, it can be confirmed that the air conditioner is in the third refrigerant loss state.

[0105] The present scheme can more accurately evaluate the refrigerant loss condition of the air conditioner through the judgment of multiple conditions, which is beneficial to fault positioning and analysis, and reduces the complaint rate and the repair rate.

[0106] It should be noted that, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders.

[0107] like Figure 6 The diagram shown is a structural schematic of a refrigerant shortage detection device 600 for an air conditioner provided in an embodiment of this application. The refrigerant shortage detection device 600 is disposed on a processor.

[0108] Specifically, the refrigerant shortage detection device 600 for the air conditioner may include:

[0109] The first acquisition unit 601 is used to acquire the current air outlet temperature of the air outlet;

[0110] The determining unit 602 is used to acquire the operating conditions of the air conditioner and determine the reference air outlet temperature based on the operating conditions.

[0111] Calculation unit 603 is used to calculate a first difference between the current outlet air temperature and the reference outlet air temperature;

[0112] The second acquisition unit 604 is used to acquire the current exhaust temperature of the compressor's exhaust port if the absolute value of the first difference is greater than the first difference threshold.

[0113] The detection unit 605 is used to determine the degree of refrigerant shortage of the air conditioner based on the current exhaust temperature.

[0114] In some embodiments of this application, the detection unit 605 may be specifically used to: obtain a reference exhaust temperature corresponding to the operating condition; if the current exhaust temperature is greater than the reference exhaust temperature, calculate a second difference between the current exhaust temperature and the reference exhaust temperature; if the absolute value of the second difference is greater than a second difference threshold, determine that the air conditioner is in a first refrigerant shortage state; the first refrigerant shortage state is used to indicate that the air conditioner has a refrigerant shortage.

[0115] In some embodiments of this application, the first refrigerant shortage state may include a first sub-state and a second sub-state; the detection unit 605 may be specifically used to: if the absolute value of the second difference is greater than the second difference threshold and the absolute value of the first difference is less than the third difference threshold, then determine that the air conditioner is in the first sub-state, wherein the third difference threshold is greater than the first difference threshold, and the degree of refrigerant shortage in the first sub-state is less than the degree of refrigerant shortage in the second sub-state.

[0116] In some embodiments of the present application, the detection unit 605 can be specifically configured to: if the absolute value of the second difference value is greater than the second difference value threshold, and the absolute value of the first difference value is greater than or equal to the third difference value threshold, determine that the air conditioner is in the second sub-state.

[0117] In some embodiments of the present application, the detection unit 605 can be specifically configured to: obtain an ambient temperature of an environment in which the air conditioner is located, and a historical discharge temperature of a discharge port of the compressor; the historical discharge temperature is a discharge temperature before a preset time length; calculate a third difference value between the current discharge temperature and the historical discharge temperature; calculate a fourth difference value between the current discharge temperature and the ambient temperature; if the absolute value of the third difference value is greater than a fourth difference value threshold, and the absolute value of the fourth difference value is greater than a fifth difference value threshold, determine that the air conditioner is in a second refrigerant loss state, and a refrigerant loss degree of the first refrigerant loss state is less than a refrigerant loss degree of the second refrigerant loss state.

[0118] In some embodiments of the present application, the detection unit 605 can be specifically configured to: if the absolute value of the third difference value is less than or equal to the fourth difference value threshold, and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold, determine that the air conditioner is in a third refrigerant loss state, and a refrigerant loss degree of the second refrigerant loss state is less than a refrigerant loss degree of the third refrigerant loss state.

[0119] In some embodiments of the present application, the detection unit 605 can be specifically configured to: if the absolute value of the third difference value is less than or equal to the fourth difference value threshold, and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold, obtain a current suction temperature of a suction port of the compressor, and a reference suction temperature of the suction port when the compressor is started for a preset time length; calculate a fifth difference value between the current suction temperature and the reference suction temperature; if the absolute value of the fifth difference value is greater than a sixth difference value threshold, determine that the air conditioner is in the third refrigerant loss state.

[0120] In some embodiments of the present application, the first obtaining unit 601 can also be configured to: obtain a current running power of the air conditioner, and a reference power range corresponding to the running condition; and the second obtaining unit 604 can be configured to: if the current running power is within the reference power range, obtain the current discharge temperature.

[0121] It should be noted that, for the convenience and brevity of description, the specific working process of the refrigerant loss detection device 600 of the air conditioner can refer to Figures 1 to 5 the corresponding process of the method, which will not be repeated here.

[0122] AsFigure 7 As shown in the schematic diagram of an air conditioner provided by the embodiment of the present application, the air conditioner can include a casing, an evaporator, a compressor, a memory, at least one processor, and a computer program stored in the memory and executable on the at least one processor, the casing is provided with an air outlet corresponding to the evaporator, and the at least one processor implements the following steps when executing the computer program: Figure 1 The steps of the refrigerant absence detection method of the air conditioner.

[0123] For example, the computer program can be divided into a first acquisition unit, a determination unit, a calculation unit, a second acquisition unit, and a detection unit. The specific functions of each unit are as follows: the first acquisition unit is configured to acquire a current air outlet temperature of the air outlet; the determination unit is configured to acquire an operating condition of the air conditioner and determine a reference air outlet temperature according to the operating condition; the calculation unit is configured to calculate a first difference between the current air outlet temperature and the reference air outlet temperature; the second acquisition unit is configured to acquire a current exhaust temperature of an exhaust port of the compressor if an absolute value of the first difference is greater than a first difference threshold; and the detection unit is configured to determine a refrigerant absence degree of the air conditioner according to the current exhaust temperature.

[0124] Those skilled in the art can understand that Figure 7 The air conditioner is only an example and does not constitute a limitation on the air conditioner, and can include more or fewer components than the schematic diagram, or combine certain components, or different components, for example, the air conditioner can also include a compressor, an input / output device, a bus, and the like.

[0125] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0126] The memory can be an internal storage unit of the air conditioner, such as a hard disk or a memory of the air conditioner. The memory can also be an external storage device of the air conditioner, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory can also include both the internal storage unit and the external storage device of the air conditioner. The memory is used to store the computer program and other programs and data required by the air conditioner. The memory can also be used to temporarily store data that has been output or will be output.

[0127] As shown in Figure 8 , a schematic diagram of an electronic device provided by an embodiment of the present application is shown, which can be an air conditioner, or can also be other electronic devices for refrigerant absence detection. The electronic device can include a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a refrigerant absence detection program of an air conditioner. The processor implements the steps in the refrigerant absence detection method embodiments of the various air conditioners when executing the computer program, such as steps S101-S105 shown in Figure 1 . Alternatively, the processor implements the functions of the modules / units in the various device embodiments when executing the computer program, such as the first acquisition unit 601, the determination unit 602, the calculation unit 603, the second acquisition unit 604, and the detection unit 605 shown in Figure 6 .

[0128] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the electronic device.

[0129] It should be noted that, for the convenience and brevity of description, the structure of the electronic device can also refer to the specific description of the structure in the air conditioner and Figure 7 the method embodiments shown in Figure 1 , which will not be repeated here.

[0130] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be realized in the form of hardware or software. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0131] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0132] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0133] In the embodiments provided in the present application, it should be understood that the disclosed devices / equipment and methods can be implemented in other ways. For example, the device / equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0134] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0135] In addition, each of the function units in each of the embodiments of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0136] The integrated module / unit, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiment methods can also be implemented by a computer program instructing related hardware to complete, and the computer program can be stored in a computer-readable storage medium. When the processor executes the computer program, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms, etc. The computer-readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0137] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A refrigerant deficiency detection method for an air conditioner, characterized by comprising: The air conditioner comprises a shell, an evaporator and a compressor, the shell is provided with an air outlet corresponding to the evaporator; the refrigerant deficiency detection method of the air conditioner comprises: obtaining a current air outlet temperature of the air outlet; obtaining an operating condition of the air conditioner, and determining a reference air outlet temperature according to the operating condition; calculating a first difference between the current air outlet temperature and the reference air outlet temperature; if the absolute value of the first difference is greater than a first difference threshold, obtaining a current exhaust temperature of an exhaust port of the compressor; determining a refrigerant deficiency degree of the air conditioner according to the current exhaust temperature; wherein, the determining of the refrigerant deficiency degree of the air conditioner according to the current exhaust temperature comprises: obtaining a reference exhaust temperature corresponding to the operating condition; if the current exhaust temperature is greater than the reference exhaust temperature, calculating a second difference between the current exhaust temperature and the reference exhaust temperature; if the absolute value of the second difference is greater than a second difference threshold, determining that the air conditioner is in a first refrigerant deficiency state; the first refrigerant deficiency state is used to indicate that the air conditioner has a refrigerant deficiency; if the current exhaust temperature is less than or equal to the reference exhaust temperature, obtaining an ambient temperature of an environment in which the air conditioner is located and a historical exhaust temperature of the exhaust port of the compressor; the historical exhaust temperature is an exhaust temperature before a preset time length; calculating a third difference between the current exhaust temperature and the historical exhaust temperature; calculating a fourth difference between the current exhaust temperature and the ambient temperature; if the absolute value of the third difference is greater than a fourth difference threshold, and the absolute value of the fourth difference is greater than a fifth difference threshold, determining that the air conditioner is in a second refrigerant deficiency state, and a refrigerant deficiency degree of the first refrigerant deficiency state is less than a refrigerant deficiency degree of the second refrigerant deficiency state.

2. The refrigerant absence detection method of the air conditioner according to claim 1, wherein The first refrigerant deficiency state comprises a first sub-state and a second sub-state; if the absolute value of the second difference is greater than the second difference threshold, and the absolute value of the first difference is less than a third difference threshold, determining that the air conditioner is in the first sub-state, wherein the third difference threshold is greater than the first difference threshold, and a refrigerant deficiency degree of the first sub-state is less than a refrigerant deficiency degree of the second sub-state. if the absolute value of the second difference is greater than the second difference threshold, and the absolute value of the first difference is greater than or equal to the third difference threshold, determining that the air conditioner is in the second sub-state.

3. The refrigerant deficiency detection method of the air conditioner according to claim 2, wherein after the obtaining of the ambient temperature of the environment in which the air conditioner is located and the historical exhaust temperature of the exhaust port of the compressor, the refrigerant deficiency detection method of the air conditioner further comprises: ​ 4. The refrigerant deficiency detection method of the air conditioner according to claim 1, wherein ​ If the absolute value of the third difference value is less than or equal to the fourth difference value threshold and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold, it is determined that the air conditioner is in a third refrigerant loss state, and a refrigerant loss degree of the second refrigerant loss state is less than a refrigerant loss degree of the third refrigerant loss state.

5. The refrigerant deficiency detection method of the air conditioner according to claim 4, wherein The determining that the air conditioner is in the third refrigerant loss state if the absolute value of the third difference value is less than or equal to the fourth difference value threshold and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold comprises: If the absolute value of the third difference value is less than or equal to the fourth difference value threshold and the absolute value of the fourth difference value is less than or equal to the fifth difference value threshold, a current suction temperature of a suction port of the compressor and a reference suction temperature of the suction port when the compressor is started for a preset time length are obtained; A fifth difference value between the current suction temperature and the reference suction temperature is calculated. If the absolute value of the fifth difference value is greater than a sixth difference value threshold, it is determined that the air conditioner is in the third refrigerant loss state.

6. The refrigerant deficiency detection method for an air conditioner according to any one of claims 1 to 5, characterized in that, Before the obtaining the current discharge temperature of the discharge port of the compressor, the method comprises: A current operating power of the air conditioner and a reference power range corresponding to the operating condition are obtained. Correspondingly, the obtaining the current discharge temperature of the discharge port of the compressor comprises: If the current operating power is within the reference power range, the current discharge temperature is obtained.

7. An air conditioner comprising a casing, an evaporator, a compressor, a memory, at least one processor, and a computer program stored in the memory and operable on the at least one processor, the casing being provided with an air outlet corresponding to the evaporator, characterized in that, The at least one processor executes the computer program to implement the steps of the refrigerant loss detection method of the air conditioner according to any one of claims 1 to 6.

8. A computer-readable storage medium storing a computer program, the computer-readable storage medium comprising: The computer program is executed by the processor to implement the steps of the refrigerant loss detection method of the air conditioner according to any one of claims 1 to 6.

Images