Refrigerant diagnosis method and device of air conditioning system, storage medium and air conditioning system

Abstract

The invention relates to the technical field of equipment diagnosis, and particularly discloses a refrigerant diagnosis method and device of an air conditioning system, a storage medium and the air conditioning system.The air conditioning system comprises a high-pressure tank, and the refrigerant diagnosis method of the air conditioning system comprises the steps that when it is determined that the air conditioning system is in a preset diagnosis state, the high-pressure tank is started; the total diagnosis time length of the air conditioning system, the refrigerant temperature of the high-pressure tank, the environment temperature, the target condensation heat dissipation amount when the high-pressure tank is full of liquid and the reference refrigerant amount of a circulating flow path of the air conditioning system are obtained; according to the total diagnosis duration, the refrigerant temperature of the high-pressure tank and the environment temperature, the current condensation heat dissipation amount of the high-pressure tank is determined; when the current condensation heat dissipating capacity is larger than or equal to the target condensation heat dissipating capacity, the actual refrigerant amount of a circulating flow path of the air conditioner system is obtained; and refrigerant diagnosis of the air conditioning system is completed according to the actual refrigerant amount and the reference refrigerant amount, so that whether the refrigerant leakage condition or the refrigerant shortage condition exists in the air conditioning system can be accurately diagnosed, and the control blind area of the air conditioning system is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment diagnosis, in particular to a refrigerant diagnosis method and device of an air conditioning system, a storage medium and an air conditioning system. BACKGROUND

[0002] In the running process of the air conditioning system, the detection of the refrigerant quantity is very important, which is specifically used to determine whether the running condition is normally running or whether the refrigerant leaks. The air source heat pump air conditioner is generally provided with a high-pressure tank, but if no liquid level sensor is added in the high-pressure tank, the refrigerant condition cannot be identified, which brings some blind area to the control of the air conditioning system. In particular, in the low refrigerant condition, the heating mode may not be obvious, but once the cooling mode is switched, the low refrigerant condition may be obvious, and the cooling condition cannot be normally completed. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the first object of the present application is to provide a refrigerant diagnosis method of an air conditioning system, which can accurately diagnose whether the air conditioning system has a refrigerant leakage condition or a low refrigerant condition, and reduce the control blind area of the air conditioning system.

[0004] The second object of the present application is to provide a computer-readable storage medium.

[0005] The third object of the present application is to provide a refrigerant diagnosis device of an air conditioning system.

[0006] The fourth object of the present application is to provide an air conditioning system.

[0007] To achieve the above objects, the first aspect of the present application provides a refrigerant diagnosis method of an air conditioning system, the air conditioning system comprising a high-pressure tank, the method comprising: when it is determined that the air conditioning system is in a preset diagnosis state, acquiring a diagnosis total time length of the air conditioning system, a refrigerant temperature of the high-pressure tank, an environment temperature, a target condensation heat dissipation amount when the high-pressure tank is full of liquid, and a reference refrigerant quantity of a circulating flow path of the air conditioning system; determining a current condensation heat dissipation amount of the high-pressure tank according to the diagnosis total time length, the refrigerant temperature of the high-pressure tank and the environment temperature; when the current condensation heat dissipation amount is greater than or equal to the target condensation heat dissipation amount, acquiring an actual refrigerant quantity of the circulating flow path of the air conditioning system; and completing the refrigerant diagnosis of the air conditioning system according to the actual refrigerant quantity and the reference refrigerant quantity.

[0008] The air conditioning system of this invention includes a high-pressure tank. In the refrigerant diagnosis method of this air conditioning system, the state of the air conditioning system is first determined. When the air conditioning system is determined to be in a preset diagnosis state, the total diagnosis time, ambient temperature, refrigerant temperature of the high-pressure tank, target condensation heat dissipation when the high-pressure tank is full, and reference refrigerant quantity in the air conditioning system circulation path are obtained. Based on the obtained total diagnosis time, ambient temperature, and refrigerant temperature of the high-pressure tank, the current condensation heat dissipation of the high-pressure tank can be determined. By judging the relationship between the current condensation heat dissipation and the target condensation heat dissipation, when the current condensation heat dissipation is greater than or equal to the target condensation heat dissipation, the actual refrigerant quantity in the air conditioning system circulation path is obtained. Based on the actual refrigerant quantity and the reference refrigerant quantity, the refrigerant of the air conditioning system can be diagnosed, thereby accurately diagnosing whether there is a refrigerant leak or insufficient refrigerant in the air conditioning system, reducing the control blind spot of the air conditioning system.

[0009] In some embodiments of the present invention, the method further includes: acquiring the operating mode, target adjustment temperature, operating status, and ambient temperature of the air conditioning system; and determining that the air conditioning system is in the preset diagnostic state when the operating mode is a heating adjustment mode, the target adjustment temperature is within a first preset temperature range, the operating status is a start-up completed state, and the ambient temperature is within a second preset temperature range.

[0010] In some embodiments of the present invention, the method further includes: when the total diagnostic time is greater than a first preset time and the current condensing heat dissipation is less than the target condensing heat dissipation, acquiring the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, and the actual subcooling and target subcooling of the condenser in the air conditioning system; and performing refrigerant leakage diagnosis on the air conditioning system based on the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, the actual subcooling and target subcooling of the condenser, and the ambient temperature.

[0011] In some embodiments of the present invention, the method further includes: obtaining the gaseous refrigerant enthalpy, liquid refrigerant enthalpy, gaseous refrigerant density, and the volume of the high-pressure tank; and determining the target condensation heat dissipation as the product of the gaseous refrigerant density and the volume multiplied by the difference between the gaseous refrigerant enthalpy and the liquid refrigerant enthalpy.

[0012] In some embodiments of the present invention, determining the current condensation heat dissipation of the high-pressure tank based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature includes: determining the heat transfer coefficient between the refrigerant inside the high-pressure tank and the environment based on the refrigerant temperature and the ambient temperature; and calculating the current condensation heat dissipation of the high-pressure tank within the total diagnostic time based on the refrigerant temperature, the ambient temperature, and the heat transfer coefficient.

[0013] In some embodiments of the present invention, refrigerant diagnosis of the air conditioning system is performed based on the actual refrigerant quantity and the reference refrigerant quantity, including: obtaining the difference between the reference refrigerant quantity and the actual refrigerant quantity; determining that the air conditioning system has a refrigerant leak when the ratio of the difference to the reference refrigerant quantity is greater than a preset refrigerant ratio; and determining that the air conditioning system has not a refrigerant leak when the ratio of the difference to the reference refrigerant quantity is less than or equal to the preset refrigerant ratio.

[0014] In some embodiments of the present invention, before obtaining the actual refrigerant quantity in the air conditioning system circulation path, the method further includes: obtaining the condensing temperature range and the evaporating temperature range of the air conditioning system within a second preset time period, and determining that the condensing temperature range is less than or equal to a first temperature threshold and the evaporating temperature range is less than or equal to a second temperature threshold.

[0015] In some embodiments of the present invention, the method further includes: acquiring refrigerant diagnostic results and refrigerant diagnostic abnormality information of the air conditioning system; determining and displaying display codes corresponding to the refrigerant diagnostic results and / or the refrigerant diagnostic abnormality information.

[0016] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing a refrigerant diagnostic program for an air conditioning system. When the refrigerant diagnostic program for the air conditioning system is executed by a processor, it implements the refrigerant diagnostic method for the air conditioning system described in any of the above embodiments.

[0017] The computer-readable storage medium of this invention executes a refrigerant diagnostic program for an air conditioning system stored thereon via a processor, which can accurately diagnose whether the air conditioning system has a refrigerant leak or low refrigerant levels, thereby reducing the control blind spot of the air conditioning system.

[0018] To achieve the above objectives, a third aspect of the present invention provides a refrigerant diagnostic device for an air conditioning system. The air conditioning system includes a high-pressure tank. The device includes: an acquisition module, configured to acquire, when the air conditioning system is determined to be in a preset diagnostic state, the total diagnostic time of the air conditioning system, the refrigerant temperature of the high-pressure tank, the ambient temperature, the target condensation heat dissipation when the high-pressure tank is full, and the reference refrigerant quantity in the air conditioning system's circulation path; a determination module, configured to determine the current condensation heat dissipation of the high-pressure tank based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature; the acquisition module is further configured to acquire the actual refrigerant quantity in the air conditioning system's circulation path when the current condensation heat dissipation is greater than or equal to the target condensation heat dissipation; and a diagnostic module, configured to perform a refrigerant diagnostic on the air conditioning system based on the actual refrigerant quantity and the reference refrigerant quantity.

[0019] The air conditioning system of this invention includes a high-pressure tank. In the refrigerant diagnostic device of the air conditioning system, the determining module first determines the state of the air conditioning system. When the air conditioning system is determined to be in a preset diagnostic state, the acquiring module acquires the total diagnostic time, ambient temperature, refrigerant temperature of the high-pressure tank, target condensation heat dissipation when the high-pressure tank is full, and reference refrigerant quantity in the air conditioning system circulation path. Based on the acquired total diagnostic time, ambient temperature, and refrigerant temperature of the high-pressure tank, the determining module can determine the current condensation heat dissipation of the high-pressure tank. By judging the relationship between the current condensation heat dissipation and the target condensation heat dissipation, when the current condensation heat dissipation is greater than or equal to the target condensation heat dissipation, the acquiring module acquires the actual refrigerant quantity in the air conditioning system circulation path. The diagnostic module can diagnose the refrigerant of the air conditioning system based on the actual refrigerant quantity and the reference refrigerant quantity, thereby accurately diagnosing whether the air conditioning system has a refrigerant leak or insufficient refrigerant, reducing the control blind spot of the air conditioning system.

[0020] To achieve the above objectives, a fourth aspect of the present invention provides an air conditioning system that includes the refrigerant diagnostic device of the air conditioning system described above.

[0021] The air conditioning system of this invention, through the refrigerant diagnostic device of the air conditioning system in the above embodiment, can accurately diagnose whether there is a refrigerant leak or a lack of refrigerant in the air conditioning system, thereby reducing the control blind spot of the air conditioning system.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an air conditioning system in one embodiment of the present invention; Figure 2 This is a flowchart of a refrigerant diagnosis method for an air conditioning system according to one embodiment of the present invention; Figure 3 This is a flowchart of a refrigerant diagnosis method for an air conditioning system in another embodiment of the present invention; Figure 4 This is a flowchart of a refrigerant diagnosis method for an air conditioning system in another embodiment of the present invention; Figure 5 This is a block diagram of the refrigerant diagnostic device for an air conditioning system in an embodiment of the present invention; Figure 6 This is a block diagram of an air conditioning system according to an embodiment of the present invention. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following description, with reference to the accompanying drawings, illustrates the refrigerant diagnostic method and apparatus, storage medium, and air conditioning system of the present invention.

[0026] Figure 1 This is a schematic diagram of the structure of an air conditioning system in one embodiment of the present invention.

[0027] like Figure 1 As shown, the air conditioning system includes a compressor, a four-way valve, a plate heat exchanger, a high-pressure tank, a finned heat exchanger, and an electronic expansion valve. Among these, Tp, Th, T4, T2B, Twout, Twin, T2, T3, and TL are all temperature sensors. Tp, Th, T2B, Twout, Twin, and T2 are installed in the air conditioning system's circulation path to detect temperature information at corresponding locations within the circulation path. T4 detects the ambient temperature, T3 detects the coil temperature of the finned heat exchanger, and TL detects the indoor ambient temperature. The plate heat exchanger is also connected to an indoor heater, such as a radiator or underfloor heating pipe. Heat is absorbed in the plate heat exchanger and released into the indoor environment via water as a transfer medium. The inlet pipe contains a pressure relief valve, an expansion tank, and an inlet water temperature sensor (Twin), while the outlet pipe contains a flow switch, a water pump, an air vent, and an outlet water temperature sensor (Twout). It should be noted that in the diagram, D-1, D-2, S-1, S-2, E-1, C-1, C-2, W-1, W-2, L-1, L-2, L-3, L-4, L-5, and L-6 are used to indicate connecting pipelines, EXN1 indicates the electronic expansion valve, and other switches, sensors, etc., can be found in the reference diagram. Figure 1 The specific labeling is as follows: When the air conditioning system is in heating mode, the compressor generates high-temperature and high-pressure refrigerant, which exchanges heat with the indoor heater through a plate heat exchanger. Afterward, it flows to the finned heat exchanger for condensation, forming low-temperature and low-pressure refrigerant that returns to the compressor.

[0028] Figure 2 This is a flowchart of a refrigerant diagnosis method for an air conditioning system according to one embodiment of the present invention.

[0029] like Figure 2 As shown, this invention proposes a refrigerant diagnosis method for an air conditioning system, which includes the following steps: S10, when the air conditioning system is determined to be in the preset diagnostic state, obtain the total diagnostic time of the air conditioning system, the refrigerant temperature of the high-pressure tank, the ambient temperature, the target condensation heat dissipation when the high-pressure tank is full of liquid, and the reference refrigerant quantity of the air conditioning system circulation path.

[0030] Specifically, before performing refrigerant diagnostics on the air conditioning system, it is necessary to determine whether the air conditioning system is in a preset diagnostic state. Once it is determined that the air conditioning system is in a preset diagnostic state, subsequent diagnostic steps can be performed. In some embodiments, the preset diagnostic state can be determined using four parameters: the air conditioning system's operating mode, target temperature, operating status, and ambient temperature. Specifically, when the operating mode is heating mode, the target temperature is within a first preset temperature range, the operating status is in the start-up completed state, and the ambient temperature is within a second preset temperature range, the air conditioning system can be determined to be in a preset diagnostic state. The first preset temperature range can be 35 degrees Celsius to 55 degrees Celsius, and the second preset temperature range can be -25 degrees Celsius to 35 degrees Celsius. It should be noted that the four parameters used to determine the preset diagnostic state in this embodiment are not unique. They can be verified through experimental results to identify the relevant parameters that significantly affect the diagnostic results. Then, the controlled variable method can be used to control these relevant parameters to determine their appropriate value ranges.

[0031] After confirming that the air conditioning system is in the preset diagnostic state, parameters such as the total diagnostic time, refrigerant temperature of the high-pressure tank, ambient temperature, target condensing heat dissipation when the high-pressure tank is full, and reference refrigerant quantity in the air conditioning system's circulation path can be obtained. The total diagnostic time is the total time the air conditioning system spends performing refrigerant diagnostics. Specifically, if the refrigerant quantity is too low to meet the requirement of a full high-pressure tank, the system will remain in the refrigerant diagnostic stage. Therefore, to prevent this, the total diagnostic time needs to be obtained. The refrigerant temperature of the high-pressure tank, ambient temperature, target condensing heat dissipation when the high-pressure tank is full, and total diagnostic time can be input into the corresponding calculation and judgment mode to determine whether the high-pressure tank is full. Therefore, it is necessary to obtain each parameter. This can be achieved by setting appropriate sensors, such as refrigerant temperature and ambient temperature. The target condensing heat dissipation and total diagnostic time can be directly obtained from the memory. The air conditioning system can store the target condensing heat dissipation when the high-pressure tank is full and the total diagnostic time in the memory before leaving the factory.

[0032] S20 determines the current condensation heat dissipation of the high-pressure tank based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature.

[0033] Specifically, see Figure 1As shown, since the high-pressure tank is located close to the T2 temperature sensor, and the refrigerant flowing through the T2 temperature sensor's path is destined for the high-pressure tank, the temperature detected by the T2 temperature sensor can be determined as the refrigerant temperature of the high-pressure tank. The ambient temperature can be obtained using the T4 temperature sensor. The total diagnostic time can be started once the air conditioning system is in the preset diagnostic state, and the timing duration is the total diagnostic time. After determining the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature, the current condensation heat dissipation of the high-pressure tank can be calculated using the following formula. ,in, This indicates the current condensation heat loss of the high-pressure tank. Indicates the total diagnosis time. This indicates the refrigerant temperature of the high-pressure tank. Indicates ambient temperature. This indicates the heat transfer coefficient between the refrigerant inside the high-pressure tank and the environment. The size is related to the ambient temperature and the refrigerant temperature of the high-pressure tank, i.e. , This refers to the heat transfer area during the heat exchange process between the high-pressure tank and the environment; it can be the cross-section of the high-pressure tank.

[0034] S30: When the current condensing heat dissipation is greater than or equal to the target condensing heat dissipation, obtain the actual refrigerant quantity in the air conditioning system circulation path.

[0035] Specifically, in this embodiment, the target condensation heat dissipation means that the refrigerant in the high-pressure tank is entirely liquid and in a full state. This can be achieved by obtaining the enthalpy of the gaseous refrigerant, the enthalpy of the liquid refrigerant, the density of the gaseous refrigerant, and the volume of the high-pressure tank. The target condensation heat dissipation can be calculated based on these values. Specifically, the target condensation heat dissipation can be determined by multiplying the product of the gaseous refrigerant density and volume by the difference between the enthalpy of the gaseous and liquid refrigerant. ,in, Indicates the target condensation heat dissipation. This indicates the density of the gaseous refrigerant. This indicates the volume of the high-pressure tank. This represents the enthalpy value of the gaseous refrigerant. This indicates the enthalpy of the liquid refrigerant. If the current condensation heat dissipation is greater than or equal to the target condensation heat dissipation, the high-pressure tank is full. If the current condensation heat dissipation is less than the target condensation heat dissipation, the high-pressure tank is not yet full and may be in a gaseous or gas-liquid mixture state. When the current condensation heat dissipation is greater than or equal to the target condensation heat dissipation, i.e., the high-pressure tank is full, the remaining refrigerant in the air conditioning system's circulation path can be measured, indicating the actual amount of refrigerant in the air conditioning system's circulation path.

[0036] In some embodiments, the refrigerant diagnosis method for an air conditioning system further includes: when the total diagnosis time is greater than a first preset time and the current condensing heat dissipation is less than the target condensing heat dissipation, acquiring the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, and the actual subcooling and target subcooling of the condenser in the air conditioning system; and performing refrigerant leakage diagnosis on the air conditioning system based on the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, the actual subcooling and target subcooling of the condenser, and the ambient temperature.

[0037] Specifically, if the total diagnostic time exceeds the first preset time and the current condensation heat dissipation is less than the target condensation heat dissipation, it indicates that the refrigerant currently present in the air conditioning system's circulation path is insufficient to fill the high-pressure tank, suggesting a possible refrigerant leak. Therefore, to further diagnose the refrigerant leak, this embodiment also acquires the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, and the actual and target subcooling of the condenser. Refrigerant leak diagnosis is then performed based on these acquired parameters combined with the ambient temperature. See Table 1 for details; if three of the five criteria in Table 1 are met, the air conditioning system is considered to have experienced a refrigerant leak.

[0038] Table 1

[0039] Where Pe represents the pressure inside the evaporator, SH represents the return superheat of the compressor, DSH represents the discharge superheat of the compressor, SC represents the actual subcooling of the condenser, SCS represents the target subcooling of the condenser, and T4 represents the ambient temperature. It should be noted that the unit of temperature in Table 1 is degrees Celsius, and the unit of pressure is megapascals.

[0040] S40 performs refrigerant diagnosis on the air conditioning system based on the actual refrigerant quantity and the reference refrigerant quantity.

[0041] Specifically, in this embodiment, the reference refrigerant quantity can be the refrigerant quantity in the air conditioning system's circulation path obtained before the air conditioning system leaves the factory, under conditions such as operating the air conditioning system in heating test mode and having the high-pressure tank full of refrigerant. This refrigerant quantity can be used as the reference refrigerant quantity. After the air conditioning system leaves the factory, the actual refrigerant quantity calculated can be compared with the reference refrigerant quantity, thereby completing the refrigerant diagnosis of the air conditioning system.

[0042] like Figure 3 As shown, in some embodiments of the present invention, refrigerant diagnosis of the air conditioning system is performed based on the actual refrigerant quantity and the reference refrigerant quantity, including: S301, obtain the difference between the reference refrigerant quantity and the actual refrigerant quantity.

[0043] S302, when the ratio of the difference to the reference refrigerant amount is greater than the preset refrigerant ratio, it is determined that a refrigerant leak has occurred in the air conditioning system.

[0044] S303: When the ratio of the difference to the reference refrigerant quantity is less than or equal to the preset refrigerant ratio, it is determined that no refrigerant leakage has occurred in the air conditioning system.

[0045] Specifically, after calculating the actual refrigerant quantity, this actual refrigerant quantity can be compared with the baseline refrigerant quantity. The refrigerant leakage rate of the air conditioning system can be determined using the following formula. Where M represents the refrigerant leakage amount, M0 represents the reference refrigerant amount, and M1 represents the actual refrigerant amount. The refrigerant leakage amount of the air conditioning system can be determined by calculating the proportion of the difference between the reference refrigerant amount and the actual refrigerant amount within the reference refrigerant amount. The preset refrigerant proportion can be 15%. That is, if M > 15%, it can be determined that the air conditioning system has a refrigerant leakage, while if M ≤ 15%, it can be determined that the air conditioning system has not a refrigerant leakage.

[0046] In some embodiments of the present invention, before obtaining the actual amount of refrigerant in the air conditioning system circulation path, the method further includes: obtaining the condensing temperature range and the evaporating temperature range of the air conditioning system within a second preset time period, and determining that the condensing temperature range is less than or equal to a first temperature threshold and the evaporating temperature range is less than or equal to a second temperature threshold.

[0047] Specifically, after determining that the high-pressure tank is full of refrigerant, and before obtaining the actual refrigerant quantity in the air conditioning system's circulation path, this embodiment can also determine whether the air conditioning system is in a stable operating state after the high-pressure tank is filled with refrigerant. This can be determined by the condensing and evaporating temperatures in the air conditioning system. Specifically, the range values ​​of the condensing and evaporating temperatures within a second preset time period can be obtained. If the range value is greater than the corresponding temperature comparison threshold, the air conditioning system is considered unstable; if it is less than or equal to the corresponding temperature comparison threshold, the air conditioning system is considered stable. Optionally, the second preset time period in this embodiment can be 5 minutes. The first and second temperature thresholds can be equal or unequal. For example, both the first and second preset temperatures can be 2 degrees Celsius, or the first temperature threshold can be 2.5 degrees Celsius and the second temperature threshold can be 2 degrees Celsius.

[0048] like Figure 4 As shown, in some embodiments of the present invention, the refrigerant diagnosis method for an air conditioning system further includes: S401, obtain refrigerant diagnostic results and refrigerant diagnostic abnormality information of the air conditioning system.

[0049] S402, Identify and display the display code corresponding to the refrigerant diagnostic results and / or refrigerant diagnostic abnormality information.

[0050] Specifically, to facilitate maintenance personnel or users in understanding the current status of the air conditioning system, this embodiment can also display corresponding fault codes based on the refrigerant diagnostic results and abnormal refrigerant diagnostic information. For example, when a refrigerant leak is diagnosed, the air conditioning system can be controlled to display d21. If an abnormality occurs during the refrigerant diagnostic process, such as the air conditioner not being in heating mode, the air conditioning system can be controlled to display d11; if the ambient temperature is not within the second preset temperature range, the air conditioning system can be controlled to display d12; if the target temperature is not within the first preset temperature range, the air conditioning system can be controlled to display d13, and so on. It should be noted that if the refrigerant diagnostic is normal, a corresponding code can also be displayed, which is not necessarily a fault code. For example, if the diagnosis confirms that the refrigerant is normal, d22 will be displayed; if the refrigerant diagnostic fails, d23 will be displayed.

[0051] In summary, the refrigerant diagnosis method for air conditioning systems in this embodiment of the invention can accurately diagnose whether there is a refrigerant leak or insufficient refrigerant in the air conditioning system, thereby reducing the control blind spot of the air conditioning system.

[0052] Furthermore, the present invention proposes a computer-readable storage medium storing a refrigerant diagnostic program for an air conditioning system. When the refrigerant diagnostic program for the air conditioning system is executed by a processor, it implements the refrigerant diagnostic method for the air conditioning system described in any of the above embodiments.

[0053] The computer-readable storage medium of this invention executes a refrigerant diagnostic program for an air conditioning system stored thereon via a processor, which can accurately diagnose whether the air conditioning system has a refrigerant leak or low refrigerant levels, thereby reducing the control blind spot of the air conditioning system.

[0054] Figure 5 This is a block diagram of the refrigerant diagnostic device for an air conditioning system in an embodiment of the present invention.

[0055] Furthermore, such as Figure 5 As shown, the present invention proposes a refrigerant diagnostic device 500 for an air conditioning system, wherein the air conditioning system includes a high-pressure tank, and the refrigerant diagnostic device 500 includes an acquisition module 501, a determination module 502 and a diagnostic module 503.

[0056] The acquisition module 501 is used to acquire the total diagnostic time of the air conditioning system, the refrigerant temperature of the high-pressure tank, the ambient temperature, the target condensing heat dissipation when the high-pressure tank is full, and the reference refrigerant quantity in the air conditioning system circulation path when the air conditioning system is determined to be in a preset diagnostic state. The determination module 502 is used to determine the current condensing heat dissipation of the high-pressure tank based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature. The acquisition module 501 is also used to acquire the actual refrigerant quantity in the air conditioning system circulation path when the current condensing heat dissipation is greater than or equal to the target condensing heat dissipation. The diagnosis module 503 is used to complete the refrigerant diagnosis of the air conditioning system based on the actual refrigerant quantity and the reference refrigerant quantity.

[0057] In some embodiments of the present invention, the acquisition module 501 is further configured to: acquire the operating mode, target adjustment temperature, operating status and ambient temperature of the air conditioning system; the determination module 502 is further configured to: determine that the air conditioning system is in a preset diagnostic state when the operating mode is heating adjustment mode, the target adjustment temperature is in a first preset temperature range, the operating status is start-up completed state and the ambient temperature is in a second preset temperature range.

[0058] In some embodiments of the present invention, the acquisition module 501 is further configured to: acquire the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, and the actual subcooling and target subcooling of the condenser when the total diagnostic time is greater than a first preset time and the current condensing heat dissipation is less than the target condensing heat dissipation in the air conditioning system; the diagnosis module 503 is further configured to: perform refrigerant leakage diagnosis on the air conditioning system based on the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, the actual subcooling and target subcooling of the condenser, and the ambient temperature.

[0059] In some embodiments of the present invention, the acquisition module 501 is further configured to: acquire the gaseous refrigerant enthalpy, liquid refrigerant enthalpy, gaseous refrigerant density, and the volume of the high-pressure tank; the determination module 502 is further configured to: determine the target condensation heat dissipation by multiplying the product of the gaseous refrigerant density and volume by the difference between the gaseous refrigerant enthalpy and the liquid refrigerant enthalpy.

[0060] In some embodiments of the present invention, the determining module 502 is further configured to: determine the heat transfer coefficient between the refrigerant in the high-pressure tank and the environment based on the refrigerant temperature and the ambient temperature; and calculate the current condensation heat dissipation of the high-pressure tank during the total diagnostic time based on the refrigerant temperature, the ambient temperature and the heat transfer coefficient.

[0061] In some embodiments of the present invention, the diagnostic module 503 is further configured to: obtain the difference between the reference refrigerant quantity and the actual refrigerant quantity; determine that the air conditioning system has a refrigerant leak when the ratio of the difference to the reference refrigerant quantity is greater than a preset refrigerant ratio; and determine that the air conditioning system has not a refrigerant leak when the ratio of the difference to the reference refrigerant quantity is less than or equal to the preset refrigerant ratio.

[0062] In some embodiments of the present invention, the acquisition module 501 is further configured to: before acquiring the actual amount of refrigerant in the air conditioning system circulation path, acquire the condensing temperature range and the evaporating temperature range of the air conditioning system within a second preset time period, and determine that the condensing temperature range is less than or equal to a first temperature threshold and the evaporating temperature range is less than or equal to a second temperature threshold.

[0063] In some embodiments of the present invention, the acquisition module 501 is further configured to: acquire the refrigerant diagnostic results and refrigerant diagnostic abnormality information of the air conditioning system; the determination module 502 is further configured to: determine and display the display code corresponding to the refrigerant diagnostic results and / or refrigerant diagnostic abnormality information.

[0064] It should be noted that the specific implementation of the refrigerant diagnostic device for the air conditioning system in this embodiment can be found in the specific implementation of the refrigerant diagnostic method for the air conditioning system in the above embodiments. To avoid redundancy, it will not be described again here.

[0065] In summary, the refrigerant diagnostic device for the air conditioning system in this embodiment of the invention can accurately diagnose whether the air conditioning system has a refrigerant leak or low refrigerant levels, thereby reducing the control blind spots of the air conditioning system.

[0066] Figure 6 This is a block diagram of an air conditioning system according to an embodiment of the present invention.

[0067] Furthermore, such as Figure 6 As shown, the present invention proposes an air conditioning system 600, which includes the refrigerant diagnostic device 500 of the air conditioning system in the above embodiment.

[0068] The air conditioning system of this invention, through the refrigerant diagnostic device of the air conditioning system in the above embodiment, can accurately diagnose whether there is a refrigerant leak or a lack of refrigerant in the air conditioning system, thereby reducing the control blind spot of the air conditioning system.

[0069] Furthermore, the other components and functions of the washing machine in the embodiments of the present invention are known to those skilled in the art, and will not be described in detail here to reduce redundancy.

[0070] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0071] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0072] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0075] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0076] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for diagnosing refrigerant in an air conditioning system, characterized in that, The air conditioning system includes a high-pressure tank, and the method includes: When the air conditioning system is determined to be in a preset diagnostic state, the total diagnostic time of the air conditioning system, the refrigerant temperature of the high-pressure tank, the ambient temperature, the target condensation heat dissipation when the high-pressure tank is full, and the reference refrigerant quantity of the air conditioning system circulation path are obtained. The current condensation heat dissipation of the high-pressure tank is determined based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature. When the current condensation heat dissipation is greater than or equal to the target condensation heat dissipation, the actual refrigerant quantity in the air conditioning system circulation path is obtained; The refrigerant diagnosis of the air conditioning system is completed based on the actual refrigerant quantity and the reference refrigerant quantity.

2. The refrigerant diagnostic method for an air conditioning system according to claim 1, characterized in that, The method further includes: The operating mode, target temperature, operating status, and ambient temperature of the air conditioning system are obtained. When the operating mode is heating adjustment mode, the target adjustment temperature is within the first preset temperature range, the operating state is start-up complete state, and the ambient temperature is within the second preset temperature range, the air conditioning system is determined to be in the preset diagnostic state.

3. The refrigerant diagnostic method for an air conditioning system according to claim 1, characterized in that, The method further includes: When the total diagnostic time is greater than the first preset time and the current condensation heat dissipation is less than the target condensation heat dissipation, the pressure inside the evaporator, the return superheat and exhaust superheat of the compressor, and the actual subcooling and target subcooling of the condenser in the air conditioning system are obtained. Based on the pressure inside the evaporator, the return gas superheat and exhaust superheat of the compressor, the actual subcooling and target subcooling of the condenser, and the ambient temperature, the refrigerant leakage of the air conditioning system is diagnosed.

4. The refrigerant diagnostic method for an air conditioning system according to claim 1, characterized in that, The method further includes: Obtain the enthalpy of the gaseous refrigerant, the enthalpy of the liquid refrigerant, the density of the gaseous refrigerant, and the volume of the high-pressure tank; The target condensation heat dissipation is determined by multiplying the product of the gaseous refrigerant density and the volume by the difference between the gaseous refrigerant enthalpy and the liquid refrigerant enthalpy.

5. The refrigerant diagnostic method for an air conditioning system according to any one of claims 1-4, characterized in that, The current condensation heat dissipation of the high-pressure tank is determined based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature, including: The heat transfer coefficient between the refrigerant in the high-pressure tank and the environment is determined based on the refrigerant temperature and the ambient temperature. The current condensation heat dissipation of the high-pressure tank during the total diagnostic time is calculated based on the refrigerant temperature, the ambient temperature, and the heat transfer coefficient.

6. The refrigerant diagnostic method for an air conditioning system according to any one of claims 1-4, characterized in that, Based on the actual refrigerant quantity and the reference refrigerant quantity, a refrigerant diagnosis of the air conditioning system is performed, including: Obtain the difference between the reference refrigerant quantity and the actual refrigerant quantity; When the ratio of the difference to the reference refrigerant quantity is greater than a preset refrigerant ratio, it is determined that the air conditioning system has experienced a refrigerant leak. When the ratio of the difference to the reference refrigerant quantity is less than or equal to a preset refrigerant ratio, it is determined that no refrigerant leakage has occurred in the air conditioning system.

7. The refrigerant diagnostic method for an air conditioning system according to any one of claims 1-4, characterized in that, Before obtaining the actual refrigerant quantity in the air conditioning system's circulation path, the method further includes: The condensing temperature range and evaporating temperature range of the air conditioning system are obtained within a second preset time period, and it is determined that the condensing temperature range is less than or equal to a first temperature threshold and the evaporating temperature range is less than or equal to a second temperature threshold.

8. The refrigerant diagnostic method for an air conditioning system according to any one of claims 1-4, characterized in that, The method further includes: Obtain the refrigerant diagnostic results and refrigerant diagnostic abnormality information of the air conditioning system; Identify and display the display codes corresponding to the refrigerant diagnostic results and / or the refrigerant diagnostic abnormality information.

9. A computer-readable storage medium, characterized in that, It stores a refrigerant diagnostic program for an air conditioning system. When the refrigerant diagnostic program for the air conditioning system is executed by the processor, it implements the refrigerant diagnostic method for the air conditioning system as described in any one of claims 1-8.

10. A refrigerant diagnostic device for an air conditioning system, characterized in that, The air conditioning system includes a high-pressure tank, and the device includes: The acquisition module is used to acquire the total diagnostic time of the air conditioning system, the refrigerant temperature of the high-pressure tank, the ambient temperature, the target condensation heat dissipation when the high-pressure tank is full, and the reference refrigerant quantity of the air conditioning system circulation path when the air conditioning system is determined to be in a preset diagnostic state. The determination module is used to determine the current condensation heat dissipation of the high-pressure tank based on the total diagnostic time, the refrigerant temperature of the high-pressure tank, and the ambient temperature. The acquisition module is also used to acquire the actual amount of refrigerant in the air conditioning system circulation path when the current condensing heat dissipation is greater than or equal to the target condensing heat dissipation. The diagnostic module is used to perform refrigerant diagnosis on the air conditioning system based on the actual refrigerant quantity and the reference refrigerant quantity.

11. An air conditioning system, characterized in that, Includes the refrigerant diagnostic device for the air conditioning system as described in claim 10.

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