Method, device, equipment and medium for determining lack of refrigerant of air conditioner

Abstract

The application discloses a kind of method, device, equipment and medium for determining that air conditioner lacks refrigerant, belong to air conditioning technical field.The method includes: obtaining the state of air conditioner, the state includes running state and shutdown state;If the state is the shutdown state, the ambient temperature and refrigerant equilibrium pressure of the air conditioner are obtained;According to the ambient temperature, determine the pressure threshold;If the number of times that the refrigerant equilibrium pressure is less than or equal to the pressure threshold is greater than the preset number of times threshold, it is determined that the air conditioner lacks refrigerant.The method can determine whether the air conditioner lacks refrigerant according to the ambient temperature and refrigerant equilibrium pressure under the shutdown state of air conditioner, the method can accurately determine when the air conditioner lacks refrigerant, and the false positive rate is reduced by setting the number of times threshold.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a method, apparatus, equipment and medium for determining refrigerant shortage in an air conditioner. Background Technology

[0002] Air conditioning is used to regulate the temperature of a space or equipment. For example, new energy vehicles use air conditioning to cool the passenger compartment and the power battery. When the air conditioner lacks refrigerant, it will not cool or will have poor cooling performance.

[0003] In related technologies, the temperature difference between the air conditioner's compressor exhaust temperature and the casing temperature is calculated. If the temperature difference is within the set temperature range, it is determined that the air conditioner is low on refrigerant.

[0004] However, the above method cannot determine some cases of fluoride deficiency, resulting in a low accuracy rate for the above determination method. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a method, apparatus, equipment and medium for determining whether an air conditioner is short of refrigerant. The method can determine whether the air conditioner is short of refrigerant based on the ambient temperature and refrigerant balance pressure when the air conditioner is off. The method can accurately determine whether the air conditioner is short of refrigerant, and at the same time, the false judgment rate can be reduced by setting a threshold number of times.

[0006] In a first aspect, the present invention provides a method for determining refrigerant shortage in an air conditioner, the method comprising:

[0007] Obtain the status of the air conditioner, including operating status and shutdown status;

[0008] If the state is the shutdown state, then obtain the ambient temperature and refrigerant balance pressure of the air conditioner;

[0009] Determine the pressure threshold based on the ambient temperature;

[0010] If the number of times the refrigerant balance pressure is less than or equal to the pressure threshold is greater than a preset number threshold, then the air conditioner is determined to be short of refrigerant.

[0011] Optionally, after obtaining the ambient temperature and high-pressure side refrigerant pressure of the air conditioner, the method further includes:

[0012] If the ambient temperature is greater than a preset temperature threshold, then the step of determining the pressure threshold based on the ambient temperature is executed.

[0013] Optionally, obtaining the ambient temperature and refrigerant balance pressure of the air conditioner includes:

[0014] Obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the air conditioner;

[0015] If the pressure difference between the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure is less than a preset pressure difference threshold, then the high-pressure side refrigerant pressure is determined as the refrigerant balance pressure.

[0016] Optionally, determining the pressure threshold based on the ambient temperature includes:

[0017] Determine the pressure threshold corresponding to the temperature range in which the ambient temperature falls.

[0018] Optionally, before determining the pressure threshold corresponding to the temperature range where the ambient temperature is located, the method further includes:

[0019] The saturation pressure corresponding to the lower limit of the temperature range when the saturation temperature of the refrigerant in the air conditioner is determined as the limit pressure of the temperature range, and the limit pressure of each temperature range is obtained.

[0020] Based on the ultimate pressure of each temperature range, a pressure threshold for each temperature range is determined, and each temperature range and each pressure threshold are recorded in a one-to-one correspondence.

[0021] Optionally, the limiting pressure of the temperature range is greater than or equal to the pressure threshold of the temperature range.

[0022] Optionally, the air conditioner is installed in the vehicle, and the method further includes:

[0023] Obtain the power status of the vehicle, which includes a power-on state and a power-off state;

[0024] If the power supply status is "power-on", then the step of obtaining the status of the air conditioner is executed.

[0025] Secondly, the present invention provides an apparatus for determining refrigerant shortage in an air conditioner, the apparatus comprising:

[0026] The first acquisition module is used to acquire the status of the air conditioner, including the running status and the shutdown status.

[0027] The second acquisition module is used to acquire the ambient temperature and refrigerant balance pressure of the air conditioner if the state is the shutdown state.

[0028] The first determining module is used to determine the pressure threshold based on the ambient temperature;

[0029] The second determining module is used to determine that the air conditioner is short of refrigerant if the number of times the refrigerant balance pressure is less than or equal to the pressure threshold is greater than the number threshold.

[0030] Thirdly, the present invention provides an electronic device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method as described in the first aspect.

[0031] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing the computer to perform the method as described in the first aspect.

[0032] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0033] This invention provides a method, apparatus, device, and medium for determining refrigerant shortage in an air conditioner. The method involves acquiring the air conditioner's status, including operating and shutdown states, to indicate whether the air conditioner is working. If the status is shutdown, it means the air conditioner is not working. The method then acquires the ambient temperature and refrigerant balance pressure to indicate whether the refrigerant quantity is sufficient. Based on the ambient temperature, a pressure threshold is determined, such that the pressure threshold corresponds to the current ambient temperature of the air conditioner. If the number of times the refrigerant balance pressure is less than or equal to the pressure threshold exceeds a certain threshold, it indicates insufficient refrigerant, thus determining that the air conditioner is short of refrigerant. This method can accurately determine when an air conditioner is short of refrigerant, and by setting a threshold, the false alarm rate is reduced.

[0034] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 This is a flowchart of a method for determining refrigerant shortage in an air conditioner, provided by an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of an air conditioner structure provided in an embodiment of the present invention;

[0038] Figure 3 This is a structural block diagram of a device for determining refrigerant shortage in an air conditioner, provided in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Unless otherwise specified, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0040] Figure 1 This is a flowchart of a method for determining refrigerant shortage in an air conditioner, as provided in an embodiment of the present invention. Figure 1 As shown, the method includes:

[0041] Step S110: Obtain the status of the air conditioner, including the running status and the shutdown status.

[0042] Figure 2 This is a schematic diagram of an air conditioner structure provided in an embodiment of the present invention, such as... Figure 1 As shown, the air conditioner includes a compressor 1, an outdoor heat exchanger 2, an expansion valve 3, an indoor heat exchanger 4, and a cooler 5. The compressor 1, outdoor heat exchanger 2, expansion valve 3, and indoor heat exchanger 4 are connected sequentially by pipes. Heat exchanger 4 is also connected to compressor 1 by pipes, forming a cooling circuit for the passenger compartment, used to cool the passenger compartment. Cooler 5 is connected to both compressor 1 and outdoor heat exchanger 2 by pipes. Compressor 1, outdoor heat exchanger 2, and cooler 5 form a cooling circuit for the battery, used to cool the battery. The refrigerant circulates within the pipes after passing through compressor 1, outdoor heat exchanger 2, expansion valve 3, and cooler 5.

[0043] Compressor 1 is used to adjust the refrigerant from low pressure to high pressure. The high-pressure refrigerant flows to outdoor heat exchanger 2, which is used to reduce the temperature of the refrigerant. After cooling, part of the refrigerant flows to expansion valve 3 and then to outdoor heat exchanger 4. Expansion valve 3 is used to regulate the refrigerant flow into outdoor heat exchanger 4. Outdoor heat exchanger 4 is used to allow the internal refrigerant to absorb heat from the hot air in the passenger compartment. The other part of the cooled refrigerant flows to cooler 5, which is used to allow the internal refrigerant to absorb heat from the battery. After absorbing heat from the hot air in the passenger compartment and the battery, the refrigerant flows back to compressor 1 for pressurization.

[0044] In this embodiment, when the air conditioner is in operation, the compressor 1, outdoor heat exchanger 2, expansion valve 3, indoor heat exchanger 4, and cooler 5 all operate to cool at least one of the passenger compartment and the battery, and the refrigerant pressure fluctuates. When the air conditioner is off, the compressor 1, outdoor heat exchanger 2, expansion valve 3, indoor heat exchanger 4, and cooler 5 all stop operating, the refrigerant gradually reaches equilibrium, and the refrigerant pressure gradually tends towards equilibrium.

[0045] Step S120: If the status is off, obtain the ambient temperature and refrigerant balance pressure of the air conditioner.

[0046] In this embodiment, since it is difficult to determine whether the air conditioner is short of refrigerant based on fluctuating refrigerant pressure, and the pressure of refrigerant in a balanced state is basically stable, the refrigerant balance pressure is obtained when the air conditioner is in an off state. Because the magnitude of the refrigerant balance pressure is affected by temperature, the ambient temperature of the air conditioner is also obtained at this time. Here, the refrigerant balance pressure is the pressure of the refrigerant when it enters a balanced state, and the ambient temperature is the temperature of the environment where the air conditioner is located.

[0047] Step S130: Determine the pressure threshold based on the ambient temperature.

[0048] In this embodiment, the pressure of the refrigerant is affected by temperature, so the ambient temperature must be taken into account when determining the pressure threshold to make the pressure threshold more accurate and correspond to the environment in which the air conditioner is located.

[0049] Step S140: If the number of times the refrigerant balance pressure is less than or equal to the pressure threshold is greater than the preset number threshold, then the air conditioner is determined to be short of refrigerant.

[0050] In this embodiment, if the refrigerant balance pressure is less than or equal to the pressure threshold once, it indicates that the amount of refrigerant may be insufficient. If multiple tests show that the refrigerant balance pressure is less than or equal to the pressure threshold, it indicates that the amount of refrigerant is very likely insufficient, thus confirming that the air conditioner is short of refrigerant. If the refrigerant balance pressure is greater than the pressure threshold, it indicates that the amount of refrigerant is normal, thus confirming that the air conditioner is not short of refrigerant.

[0051] The threshold number of tests can be 0, making the method for determining refrigerant shortage more sensitive; that is, if the refrigerant balance pressure is less than or equal to the pressure threshold, the air conditioner is determined to be short of refrigerant. Alternatively, the threshold number can be greater than 0 and be a positive integer, making the method more accurate and preventing false positives; that is, if the refrigerant balance pressure is found to be less than or equal to the pressure threshold multiple times, the air conditioner is determined to be short of refrigerant. The specific threshold number can be determined based on the user's required accuracy.

[0052] Optionally, step S120 includes:

[0053] Obtain the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure of the air conditioner; if the pressure difference between the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure is less than the preset pressure difference threshold, then the high-pressure side refrigerant pressure is determined as the refrigerant balance pressure.

[0054] In this embodiment, the pressure difference between the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure is used to determine whether the refrigerant in the air conditioner has reached a balance state during shutdown. If the pressure difference is less than a preset pressure difference threshold, it indicates that a balance state has been reached, and the higher high-pressure side refrigerant pressure is used as the refrigerant balance pressure. Next, if all the high-pressure side refrigerant pressures used as the refrigerant balance pressure are less than the pressure threshold, it indicates that the maximum refrigerant pressure is below the pressure threshold, making it more likely that the air conditioner is short of refrigerant, further improving the accuracy of the method for determining refrigerant shortage in this application.

[0055] In this embodiment, if the pressure difference is greater than or equal to the pressure difference threshold, it means that the refrigerant has not yet entered a state of equilibrium. The pressure of the refrigerant on the high-pressure side and the refrigerant on the low-pressure side of the air conditioner should continue to be obtained until the pressure difference is less than the pressure difference threshold.

[0056] In this embodiment, the downtime of the air conditioner can also be obtained; if the downtime exceeds the duration threshold, the high-pressure side refrigerant pressure of the air conditioner is obtained, and the high-pressure side refrigerant pressure is determined as the refrigerant balance pressure.

[0057] This can be understood as follows: after the air conditioner enters the off state, the refrigerant pressure on both the high-pressure and low-pressure sides gradually tends to reach equilibrium. When the off time is long enough, it indicates that the refrigerant may have reached an equilibrium state. At this point, the high-pressure side refrigerant pressure in the equilibrium state is defined as the refrigerant equilibrium pressure. The time threshold can be determined based on the air conditioner model. Different models require different amounts of time to reach equilibrium. The time required for different air conditioner models to reach equilibrium can be pre-defined, and then the corresponding time can be found based on the air conditioner model and used as the time threshold.

[0058] Optionally, after step S120, the method further includes:

[0059] If the ambient temperature is higher than the preset temperature threshold, then the step of determining the pressure threshold based on the ambient temperature is executed.

[0060] In this embodiment, considering the low-temperature performance of air conditioning refrigerant, the refrigerant balance pressure is very low at low temperatures. The difference in refrigerant balance pressure between refrigerant shortage and refrigerant abundance may not be significant, easily triggering false judgments. Therefore, step S130 is executed only when the ambient temperature is greater than a preset temperature threshold, making the method for determining air conditioning refrigerant shortage in this application more accurate and reducing the false judgment rate. If the ambient temperature is less than or equal to the temperature threshold, the process is terminated, and no refrigerant shortage determination is performed.

[0061] For example, the temperature threshold is -10°C.

[0062] Optionally, step S130 includes:

[0063] Step S1303: Determine the pressure threshold corresponding to the temperature range in which the ambient temperature is located.

[0064] In this embodiment, the refrigerant's saturation pressure varies at different saturation temperatures. Saturation temperature refers to the temperature at which the liquid and vapor are in dynamic equilibrium (saturation). Saturation pressure refers to the pressure exerted by the vapor in vapor-liquid equilibrium when the liquid's evaporation and condensation reach dynamic equilibrium.

[0065] For example, the relationship between the saturation temperature and saturation pressure of R134A refrigerant is shown in Table 1 below:

[0066] Table 1

[0067] Saturation temperature (°C) Saturation pressure (bar(a)) -20 1.33 -10 2.01 0 2.93 10 4.15 20 5.72 30 7.7 40 10.17

[0068] As shown in Table 1, the lower the saturation temperature, the lower the saturation pressure, so temperature directly affects pressure.

[0069] In this embodiment, when determining the pressure threshold based on the ambient temperature, the temperature is also divided into multiple intervals, and a pressure threshold is assigned to each temperature interval. After obtaining the ambient temperature, the temperature interval in which the ambient temperature is located is determined, and the pressure threshold corresponding to the temperature interval in which the ambient temperature is located is found.

[0070] Optionally, steps S1301 and S1302 may be included before step S1303.

[0071] Step S1301: Determine the saturation pressure corresponding to the lower limit of the temperature range when the saturation temperature of the refrigerant in the air conditioner is the ultimate pressure of the temperature range, and obtain the ultimate pressure of each temperature range.

[0072] Step S1302: Determine the pressure threshold for each temperature range based on the limit pressure of each temperature range, and record the correspondence between each temperature range and each pressure threshold.

[0073] This embodiment also includes a method for calibrating the pressure threshold for each temperature range. Specifically, when the saturation temperature of the refrigerant is the lower limit of a temperature range, the corresponding saturation pressure is taken as the limit pressure of that temperature range, thereby obtaining the limit pressure for each temperature range. Under normal circumstances, the pressure of the refrigerant will not be lower than the limit pressure of that temperature range within a given temperature range.

[0074] Based on this ultimate pressure, the pressure threshold for the temperature range is determined. This method can be used to obtain the pressure threshold for all temperature ranges, and each temperature range and each pressure threshold can be recorded in a table. Then, the corresponding pressure threshold can be found based on the temperature range of the ambient temperature.

[0075] For example, if the saturation temperature of R134A refrigerant is 20°C, which is the lower limit of the temperature range of 20°C to 30°C, then the corresponding saturation pressure is 5.72. The limit pressure of this temperature range is 5.72, so the pressure threshold of this temperature range can be determined to be around 5.72.

[0076] Optionally, the limiting pressure of the temperature range is greater than or equal to the pressure threshold of the temperature range.

[0077] In this embodiment, the ultimate pressure can be directly determined as the pressure threshold. After the air conditioner enters the off state, if the refrigerant enters a balanced state, the refrigerant balance pressure will not be lower than the ultimate pressure if the amount of refrigerant is sufficient. Once it is lower than the ultimate pressure, it indicates that the amount of refrigerant is insufficient and the air conditioner is short of refrigerant.

[0078] To be on the safe side, the difference between the ultimate pressure and the set value can be used as the pressure threshold, where the set value is a positive number. If the refrigerant reaches a balance state, the probability of the refrigerant balance pressure falling below this pressure threshold (less than the ultimate pressure) is very low, assuming sufficient refrigerant. If it falls below this threshold, it indicates a very high probability of insufficient refrigerant, thus confirming a refrigerant shortage in the air conditioner. In this embodiment, an alarm can be triggered upon confirmation of a refrigerant shortage to alert the user and prompt timely action.

[0079] For example, if the air conditioner uses R134A refrigerant, the following alarms will be triggered: when the ambient temperature is ≥40℃ and the refrigerant balance pressure is ≤7.7 bar, the air conditioner will be determined to be low on refrigerant and an alarm will be triggered; when the ambient temperature is 30℃≤ambient temperature<40℃ and the refrigerant balance pressure is ≤5.7 bar, the air conditioner will be determined to be low on refrigerant and an alarm will be triggered; when the ambient temperature is 20℃≤ambient temperature<30℃ and the refrigerant balance pressure is ≤4.2 bar, the air conditioner will be determined to be low on refrigerant and an alarm will be triggered; when the ambient temperature is 10℃≤ambient temperature<20℃ and the refrigerant balance pressure is ≤2.9 bar, the air conditioner will be determined to be low on refrigerant and an alarm will be triggered; when the ambient temperature is 0℃≤ambient temperature<10℃ and the refrigerant balance pressure is ≤2.0 bar, the air conditioner will be determined to be low on refrigerant and an alarm will be triggered; when the ambient temperature is -10℃≤ambient temperature<0℃ and the refrigerant balance pressure is ≤1.0 bar, the air conditioner will be determined to be low on refrigerant and an alarm will be triggered.

[0080] Optionally, the air conditioning can be installed in the vehicle, and other methods include:

[0081] Obtain the vehicle's power status, which includes power-on and power-off states; if the power status is power-on, then begin the step of obtaining the air conditioning status.

[0082] In this embodiment, the method for determining whether the air conditioner is low on refrigerant can be used to detect whether the air conditioner in a vehicle is low on refrigerant. When the vehicle's power is off, the entire air conditioning system loses power, including pressure sensors that collect high-pressure and low-pressure refrigerant pressures, temperature sensors that detect ambient temperature, and other equipment. Therefore, the method for determining whether the air conditioner is low on refrigerant should be executed when the vehicle's power is on to ensure that the steps of the method can be performed normally.

[0083] Based on the same inventive concept, embodiments of the present invention also provide a device for determining if an air conditioner is short of refrigerant. Figure 3 This is a structural block diagram of a device for determining refrigerant shortage in an air conditioner, provided in an embodiment of the present invention. Figure 3 As shown, the device 300 includes a first acquisition module 301, a second acquisition module 302, a first determination module 303, and a second determination module 304.

[0084] The first acquisition module 301 is used to acquire the status of the air conditioner, including the running status and the shutdown status.

[0085] The second acquisition module 302 is used to acquire the ambient temperature and refrigerant balance pressure of the air conditioner if the status is a shutdown state.

[0086] The first determining module 303 is used to determine the pressure threshold based on the ambient temperature;

[0087] The second determining module 304 is used to determine that the air conditioner is short of refrigerant if the number of times the refrigerant balance pressure is less than or equal to the pressure threshold is greater than the number threshold.

[0088] Optionally, the device 300 also includes an execution module for:

[0089] If the ambient temperature is higher than the preset temperature threshold, then the step of determining the pressure threshold based on the ambient temperature is executed.

[0090] Optionally, the second acquisition module 302 is also used for:

[0091] Obtain the high-pressure side refrigerant pressure and low-pressure side refrigerant pressure of the air conditioner;

[0092] If the pressure difference between the high-pressure side refrigerant pressure and the low-pressure side refrigerant pressure is less than the preset pressure difference threshold, then the high-pressure side refrigerant pressure is determined as the refrigerant balance pressure.

[0093] Optionally, the first determining module 303 is also used for:

[0094] Determine the pressure threshold corresponding to the temperature range within which the ambient temperature falls.

[0095] Optionally, the device 300 further includes a third determining module for:

[0096] The saturation pressure corresponding to the lower limit of the temperature range when the saturation temperature of the refrigerant in the air conditioner is determined as the limit pressure of the temperature range, and the limit pressure of each temperature range is obtained.

[0097] Based on the ultimate pressure of each temperature range, determine the pressure threshold for each temperature range, and record the correspondence between each temperature range and each pressure threshold.

[0098] Optionally, the limiting pressure of the temperature range is greater than or equal to the pressure threshold of the temperature range.

[0099] Optionally, the air conditioning is installed in the vehicle, and the device 300 also includes a third acquisition module:

[0100] Obtain the vehicle's power status, including power-on and power-off states;

[0101] If the power supply is in the "power on" state, then the step of obtaining the air conditioner's status will begin.

[0102] It is understood that the device provided in the above embodiments is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0103] This invention also provides an electronic device that may include a processor and a memory, wherein the processor and the memory may be interconnected via a bus or other means.

[0104] The processor can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. It 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 gate or transistor logic devices, discrete hardware components, or other chips, or combinations of the above types of chips.

[0105] Memory may include mass storage for data or instructions. For example, and not limitingly, memory may include hard disk drives (HDDs), floppy disk drives, flash memory, optical disks, magneto-optical disks, magnetic tape, or Universal Serial Bus (USB) drives, or combinations of two or more of these. Where appropriate, memory may include removable or non-removable (or fixed) media. Where appropriate, memory may be internal or external to an electronic device. In a particular embodiment, memory may be non-volatile solid-state memory.

[0106] In one instance, the memory may be read-only memory (ROM). In one instance, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0107] The processor reads and executes computer program instructions stored in memory to implement any of the methods for determining refrigerant shortage in the air conditioner in the above embodiments.

[0108] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus to communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or equipment in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0109] Furthermore, in conjunction with the methods for determining air conditioner refrigerant shortage in the above embodiments, this invention can be implemented using a computer-readable storage medium. This computer-readable storage medium stores computer program instructions; when executed by a processor, these computer program instructions implement any of the methods for determining air conditioner refrigerant shortage in the above embodiments.

[0110] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The storage medium can be read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0111] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages:

[0112] This invention provides a method, apparatus, device, and medium for determining refrigerant shortage in an air conditioner. The method involves acquiring the air conditioner's status, including operating and shutdown states, to indicate whether the air conditioner is working. If the status is shutdown, it means the air conditioner is not working. The method then acquires the ambient temperature and refrigerant balance pressure to indicate whether the refrigerant quantity is sufficient. Based on the ambient temperature, a pressure threshold is determined, such that the pressure threshold corresponds to the current ambient temperature of the air conditioner. If the number of times the refrigerant balance pressure is less than or equal to the pressure threshold exceeds a certain threshold, it indicates insufficient refrigerant, thus determining that the air conditioner is short of refrigerant. This method can accurately determine when an air conditioner is short of refrigerant, and by setting a threshold, the false alarm rate is reduced.

[0113] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0114] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0115] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A method of determining a lack of refrigerant in an air conditioner, characterized by, The method comprises: obtaining a state of an air conditioner, the state comprising a running state and a shutdown state; if the state is the shutdown state, obtaining an ambient temperature and a refrigerant balance pressure of the air conditioner; determining a pressure threshold according to the ambient temperature; if a number of times that the refrigerant balance pressure is less than or equal to the pressure threshold is greater than a preset number threshold, determining that the air conditioner is refrigerant-deficient; the determining of the pressure threshold according to the ambient temperature comprises: determining a pressure threshold corresponding to a temperature interval in which the ambient temperature is located; before the determining of the pressure threshold corresponding to the temperature interval in which the ambient temperature is located, the method further comprises: determining, as a limit pressure of the temperature interval, a saturation pressure corresponding to a lower limit value of the temperature interval when a saturation temperature of refrigerant in the air conditioner is the lower limit value, to obtain a limit pressure of each temperature interval; determining a pressure threshold of each temperature interval according to the limit pressure of each temperature interval, and recording each temperature interval and each pressure threshold in a one-to-one correspondence; the limit pressure of the temperature interval is greater than or equal to the pressure threshold of the temperature interval.

2. The method of determining a lack of refrigerant of an air conditioner according to claim 1, wherein after the obtaining of the ambient temperature and the high-pressure-side refrigerant pressure of the air conditioner, the method further comprises: if the ambient temperature is greater than a preset temperature threshold, performing the step of determining the pressure threshold according to the ambient temperature.

3. The method of determining a lack of refrigerant of an air conditioner according to claim 1, wherein the obtaining of the ambient temperature and the refrigerant balance pressure of the air conditioner comprises: obtaining a high-pressure-side refrigerant pressure and a low-pressure-side refrigerant pressure of the air conditioner; if a pressure difference between the high-pressure-side refrigerant pressure and the low-pressure-side refrigerant pressure is less than a preset pressure difference threshold, determining the high-pressure-side refrigerant pressure as the refrigerant balance pressure.

4. The method of determining a lack of refrigerant of an air conditioner according to claim 1, wherein the air conditioner is arranged on a vehicle, and the method further comprises: obtaining a power supply state of the vehicle, the power supply state comprising a powered-on state and a powered-off state; if the power supply state is the powered-on state, starting to perform the step of obtaining the state of the air conditioner.

5. A device for determining refrigerant deficiency in an air conditioner, characterized in that, the device comprises: a first obtaining module configured to obtain a state of an air conditioner, the state comprising a running state and a shutdown state; a second obtaining module configured to, if the state is the shutdown state, obtain an ambient temperature and a refrigerant balance pressure of the air conditioner; a first determining module configured to determine a pressure threshold according to the ambient temperature; a second determining module configured to, if a number of times that the refrigerant balance pressure is less than or equal to the pressure threshold is greater than a preset number threshold, determine that the air conditioner is refrigerant-deficient; the determining of the pressure threshold according to the ambient temperature comprises: determining a pressure threshold corresponding to a temperature interval in which the ambient temperature is located; before the determining of the pressure threshold corresponding to the temperature interval in which the ambient temperature is located, the device further comprises a third determining module configured to: determine, as a limit pressure of the temperature interval, a saturation pressure corresponding to a lower limit value of the temperature interval when a saturation temperature of refrigerant in the air conditioner is the lower limit value, to obtain a limit pressure of each temperature interval; determine a pressure threshold of each temperature interval according to the limit pressure of each temperature interval, and record each temperature interval and each pressure threshold in a one-to-one correspondence; The limit pressure of the temperature interval is greater than or equal to a pressure threshold of the temperature interval.

6. An electronic device, comprising: Comprising: A memory and a processor, which are connected in communication with each other, the memory has stored therein computer instructions, and the processor executes the computer instructions to perform the method of any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium has stored therein computer instructions for causing the computer to perform the method of any one of claims 1-4.

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