Method, device, medium and equipment for identifying icing risk of differential pressure sensor

Abstract

This application discloses a method, device, medium, and equipment for identifying the icing risk of a differential pressure sensor, relating to the field of vehicle technology. The differential pressure sensor is used to detect the pressure differential between the upstream and downstream sides of a diesel particulate filter (DPF) in an aftertreatment system. The method includes: controlling the volume flow of the aftertreatment tank to change by more than a preset degree, and obtaining volume flow change data and pressure differential change data of the differential pressure sensor; determining a correlation result between the volume flow and the pressure differential based on the volume flow change data and the pressure differential change data; and determining that the differential pressure sensor has an icing risk if the correlation result indicates that the correlation between the volume flow and the pressure differential is less than a preset threshold. This method can accurately identify the icing risk of the differential pressure sensor.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, medium, and equipment for identifying the icing risk of a differential pressure sensor. Background Art

[0002] With the advancement of vehicle technology, vehicles are increasingly equipped with aftertreatment systems to reduce toxic and harmful exhaust emissions. These systems utilize a diesel particulate filter (DPF) within the aftertreatment tank to reduce particulate matter in exhaust. To determine if an aftertreatment system malfunctions, a differential pressure sensor is typically installed within the tank to measure the pressure difference between the upstream and downstream sides of the tank. This differential pressure is then used to perform subsequent fault diagnosis.

[0003] Currently, when the ambient temperature is low, the differential pressure sensor in the aftertreatment box is at risk of freezing, that is, the air intake pipeline of the differential pressure sensor is blocked, which leads to errors in the measured differential pressure, thereby affecting subsequent fault diagnosis.

[0004] To this end, when the ambient temperature is low, the differential pressure sensor is directly assumed to be frozen and then defrosted through a thermal management system or other means. However, when the differential pressure sensor is not frozen, unnecessary resource consumption will be caused. Summary of the Invention

[0005] The present application provides a method, apparatus, medium, and equipment for identifying the icing risk of a differential pressure sensor, which can accurately identify the icing risk of the differential pressure sensor.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a method for identifying icing risk of a differential pressure sensor, wherein the differential pressure sensor is used to detect the pressure difference between upstream and downstream of a diesel particulate filter (DPF) in an aftertreatment system. The method comprises:

[0008] Controlling the volume flow of the post-processing tank to change by more than a preset degree, and acquiring the change data of the volume flow and the change data of the pressure difference of the pressure difference sensor;

[0009] determining a correlation result between the volume flow rate and the pressure difference based on the volume flow rate change data and the pressure difference change data;

[0010] If the correlation result indicates that the correlation between the volume flow and the pressure difference is less than a preset threshold, it is determined that the pressure difference sensor has an icing risk.

[0011] In some possible implementations, within a preset time period when the volume flow of the aftertreatment tank changes by a greater than preset degree, acquiring the volume flow change data and the pressure difference change data of the pressure difference sensor includes:

[0012] Obtaining the volume flow rate corresponding to multiple time points within the preset time period, and obtaining the pressure difference corresponding to multiple time points within the preset time period;

[0013] The volume flow rates corresponding to the multiple time points are used as volume flow rate change data, and the pressure differences corresponding to the multiple time points are used as pressure difference change data.

[0014] In some possible implementations, determining a correlation result between the volume flow rate and the pressure difference based on the volume flow rate change data and the pressure difference change data includes:

[0015]

[0016] Wherein, r represents the correlation result between the volume flow rate and the pressure difference, P i Represents the pressure difference corresponding to the i-th time point among multiple time points, Represents the average pressure difference of multiple pressure differences corresponding to multiple time points, V i represents the volume flow rate corresponding to the i-th time point among multiple time points, Represents the average volume flow rate of multiple pressure differences corresponding to multiple time points.

[0017] In some possible implementations, the method further includes:

[0018] Determining the ice-melting temperature and ice-melting time corresponding to the correlation coefficient in the correlation result according to a preset mapping relationship among the coefficient, temperature, and time;

[0019] If the temperature of the aftertreatment tank reaches the ice-melting temperature and the ice-melting time period has elapsed, it is determined that the ice on the differential pressure sensor has melted.

[0020] In some possible implementations, the method further includes:

[0021] If the temperature of the aftertreatment tank cannot reach the defrosting temperature or cannot pass the defrosting time, a regeneration request is triggered to increase the temperature of the aftertreatment tank.

[0022] In some possible implementations, the method further includes:

[0023] Pressure differential-based fault diagnosis in a shielded post-processing box.

[0024] In some possible implementations, the method further includes:

[0025] If the correlation result indicates that the correlation between the volume flow and the pressure difference is greater than or equal to the preset threshold, it is determined that there is no icing risk for the differential pressure sensor.

[0026] In a second aspect, the present application provides a device for identifying icing risk of a differential pressure sensor, wherein the differential pressure sensor is used to detect the pressure difference between upstream and downstream of a diesel particulate filter (DPF) of an aftertreatment system, the device comprising:

[0027] a control unit, configured to control the volume flow of the post-processing tank to change by a greater than a preset degree;

[0028] an acquisition unit, configured to acquire volume flow rate change data and pressure difference change data of the pressure difference sensor when the volume flow rate of the post-processing tank changes by more than a preset degree;

[0029] a correlation determining unit, configured to determine a correlation result between the volume flow rate and the pressure difference based on the change data of the volume flow rate and the change data of the pressure difference;

[0030] The identification unit is configured to determine that there is an icing risk for the differential pressure sensor if the correlation result indicates that the correlation between the volume flow and the pressure difference is less than a preset threshold.

[0031] In some possible implementations, the acquisition unit is specifically used to obtain the volume flow rate corresponding to multiple time points within the preset time period, and to obtain the pressure difference corresponding to multiple time points within the preset time period; the volume flow rate corresponding to the multiple time points is used as the volume flow rate change data, and the pressure difference corresponding to the multiple time points is used as the pressure difference change data.

[0032] In some possible implementations, the correlation determination unit is specifically configured to

[0033]

[0034] Wherein, r represents the correlation result between the volume flow rate and the pressure difference, P i Represents the pressure difference corresponding to the i-th time point among multiple time points, Represents the average pressure difference of multiple pressure differences corresponding to multiple time points, V i represents the volume flow rate corresponding to the i-th time point among multiple time points, Represents the average volume flow rate of multiple pressure differences corresponding to multiple time points.

[0035] In some possible implementations, the identification unit is further used to determine the defrosting temperature and defrosting time corresponding to the correlation coefficient in the correlation result based on a pre-set mapping relationship among the coefficient, temperature, and time; if the temperature of the post-processing box reaches the defrosting temperature and the defrosting time has passed, it is determined that the ice on the differential pressure sensor has melted.

[0036] In some possible implementations, the identification unit is further configured to trigger a regeneration request to increase the temperature of the aftertreatment tank if the temperature of the aftertreatment tank cannot reach the defrosting temperature or cannot last for the defrosting time.

[0037] In some possible implementations, the device further includes a shielding unit, wherein the shielding unit is configured to shield the pressure difference-based fault diagnosis in the post-processing box.

[0038] In some possible implementations, the identification unit is further configured to determine that there is no icing risk for the differential pressure sensor if the correlation result indicates that the correlation between the volume flow and the pressure difference is greater than or equal to the preset threshold.

[0039] In a third aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and the computer program is used to execute any one of the methods described in the first aspect.

[0040] In a fourth aspect, the present application provides a device comprising: a memory and a processor; a computer program is stored in the memory; and the processor is used to execute the computer program in the memory to implement any one of the methods described in the first aspect.

[0041] It can be seen from the above technical solution that the technical solution of this application has the following beneficial effects:

[0042] This application provides a method for identifying the risk of icing in a differential pressure sensor, wherein the differential pressure sensor is used to detect the pressure differential between upstream and downstream of a diesel particulate filter (DPF) in an aftertreatment system. The method comprises: controlling the volume flow of the aftertreatment tank to change by more than a preset level, and obtaining volume flow change data and pressure differential change data from the differential pressure sensor; determining a correlation between the volume flow and the pressure differential based on the volume flow change data and the pressure differential change data; and determining that the differential pressure sensor is at risk of icing if the correlation result indicates that the correlation between the volume flow and the pressure differential is less than a preset threshold. Because volume flow and pressure differential have a strong correlation, a poor correlation indicates the presence of icing. This method, rather than directly heating and defrosting the air, reduces unnecessary resource consumption.

[0043] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in this application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of a technical feature, technical solution or beneficial effect in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the present embodiment can also be combined in any appropriate manner. Those skilled in the art will understand that the embodiment can be implemented without one or more specific technical features, technical solutions or beneficial effects of a specific embodiment. In other embodiments, additional technical features and beneficial effects can also be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A flowchart of a method for identifying icing risk of a differential pressure sensor provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of a device for identifying icing risk of a differential pressure sensor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] The terms "first", "second" and "third" in the specification, claims and drawings of this application are used to distinguish different objects rather than to limit a specific order.

[0047] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0048] In order to make the description of the following embodiments clear and concise, a brief introduction to the relevant technology is first given.

[0049] A diesel particulate filter (DPF) is used to capture particulate matter, such as soot, from exhaust. Aftertreatment systems typically include a differential pressure sensor to measure the pressure difference between the upstream and downstream sides of the DPF. However, in cold temperatures, the differential pressure sensor inside the aftertreatment tank can freeze. This can cause the sensor's air intake line to become blocked, leading to errors in the measured differential pressure and potentially affecting subsequent fault diagnosis.

[0050] Currently, when the ambient temperature is low, the differential pressure sensor is directly assumed to be frozen and then defrosted through a thermal management system or other means. However, when the differential pressure sensor is not frozen, unnecessary resource consumption, such as fuel consumption and electricity consumption, will be caused.

[0051] In view of this, an embodiment of the present application provides a method for identifying the icing risk of a differential pressure sensor, which can be performed by an identification device, wherein the identification device can be an ECU or other control unit on a vehicle.

[0052] Specifically, the differential pressure sensor is used to detect the differential pressure between the upstream and downstream sides of the diesel particulate filter (DPF) in the aftertreatment system. The method includes: controlling the volumetric flow rate of the aftertreatment tank to change by more than a preset level, and acquiring volumetric flow rate change data and differential pressure change data from the differential pressure sensor; determining a correlation between the volumetric flow rate and the differential pressure based on the volumetric flow rate change data and the differential pressure change data; and determining that the differential pressure sensor is at risk of icing if the correlation result indicates that the correlation between the volumetric flow rate and the differential pressure is less than a preset threshold. Because volumetric flow rate and differential pressure have a strong correlation, a poor correlation indicates the presence of icing. This eliminates the need for direct heating to defrost the ice, reducing unnecessary resource consumption.

[0053] In order to make the technical solution of the present application clearer and easier to understand, the technical solution of the present application is introduced below with reference to the accompanying drawings.

[0054] like Figure 1 As shown in FIG, this figure is a flow chart of a method for identifying icing risk of a differential pressure sensor provided in an embodiment of the present application, the method comprising:

[0055] S101. Identify that a volume flow rate of a post-processing box changes by more than a preset degree after the device controls the volume flow rate, and obtain change data of the volume flow rate and change data of the pressure difference of the pressure difference sensor.

[0056] The preset degree can be a predetermined degree, for example, expressed as a percentage. In some examples, the preset degree can be 40%. A change in volume flow greater than the preset degree can mean that the volume flow changes to 150% of the original volume flow, i.e., a change of 50% or greater than 40%. This can correspond to a sudden acceleration of the vehicle, for example.

[0057] In this case, the identification device acquires volume flow rate change data and pressure differential change data from the pressure differential sensor. Specifically, within a preset time period during which the volume flow of the aftertreatment tank changes by a greater than preset degree, the identification device acquires the volume flow rate corresponding to multiple time points within the preset time period, as well as the pressure differential corresponding to multiple time points within the preset time period. The volume flow rate corresponding to the multiple time points is used as the volume flow change data, and the pressure differential corresponding to the multiple time points is used as the pressure differential change data. Specifically, the volume flow rate change data and the pressure differential change data can be shown in Table 1 below.

[0058] Table 1:

[0059]

[0060] S102: The identification device determines a correlation result between the volume flow rate and the pressure difference based on the volume flow rate change data and the pressure difference change data.

[0061] In some embodiments, the identification device may use the following formula to determine the correlation result between the volume flow rate and the pressure difference:

[0062]

[0063] Wherein, r represents the correlation result between the volume flow rate and the pressure difference, P i Represents the pressure difference corresponding to the i-th time point among multiple time points, Represents the average pressure difference of multiple pressure differences corresponding to multiple time points, V i represents the volume flow rate corresponding to the i-th time point among multiple time points, Represents the average volume flow rate of multiple pressure differences corresponding to multiple time points.

[0064] It should be noted that the volume flow and the pressure difference have a strong correlation when the vehicle accelerates rapidly, that is, when the volume flow changes by more than a preset degree. Therefore, it is more accurate to judge whether the pressure difference sensor is abnormal based on the correlation between them, rather than directly assuming that the temperature sensor is abnormal when the temperature is low.

[0065] S103: If the correlation result indicates that the correlation between the volume flow rate and the pressure difference is less than a preset threshold, it is determined that there is an icing risk in the pressure difference sensor.

[0066] When the correlation result indicates that the correlation between volume flow and pressure difference is less than a preset threshold, the identification device can determine that there is a risk of icing in the pressure differential sensor. At this time, the vehicle's thermal management system can be started to perform defrosting, while shielding the fault diagnosis program associated with the pressure differential sensor to avoid misdiagnosis.

[0067] In some embodiments, the identification device can also determine the defrosting temperature and defrosting time corresponding to the correlation coefficient in the correlation result based on a pre-set mapping relationship among the coefficient, temperature, and time. Based on this, if the temperature of the post-processing box reaches the defrosting temperature and the defrosting time has passed, it can be determined that the ice on the differential pressure sensor has melted.

[0068] In other embodiments, if the temperature of the aftertreatment tank cannot reach the ice-melting temperature, or reaches the ice-melting temperature but the ice-melting time has not passed, it indicates that the heat required for ice-melting is insufficient. In this case, a regeneration request can be triggered to increase the temperature of the aftertreatment tank.

[0069] In some embodiments, if the correlation result indicates that the correlation between the volume flow rate and the pressure difference is greater than or equal to a preset threshold, it is determined that there is no icing risk for the differential pressure sensor.

[0070] This application provides a method for identifying the risk of icing in a differential pressure sensor, wherein the differential pressure sensor is used to detect the pressure differential between upstream and downstream of a diesel particulate filter (DPF) in an aftertreatment system. The method comprises: controlling the volume flow of the aftertreatment tank to change by more than a preset level, and obtaining volume flow change data and pressure differential change data from the differential pressure sensor; determining a correlation between the volume flow and the pressure differential based on the volume flow change data and the pressure differential change data; and determining that the differential pressure sensor is at risk of icing if the correlation result indicates that the correlation between the volume flow and the pressure differential is less than a preset threshold. Because volume flow and pressure differential have a strong correlation, a poor correlation indicates the presence of icing. This method, rather than directly heating and defrosting the air, reduces unnecessary resource consumption.

[0071] The embodiment of the present application also provides a device for identifying the risk of icing of a differential pressure sensor, wherein the differential pressure sensor is used to detect the pressure difference between the upstream and downstream of the diesel particulate filter DPF of the post-treatment system, see Figure 2 , which is a schematic diagram of a device for identifying icing risk of a differential pressure sensor provided by an embodiment of the present application, the device comprising:

[0072] A control unit 201 is used to control the volume flow of the post-processing tank to change by more than a preset degree;

[0073] an acquisition unit 202 for acquiring volume flow rate change data and pressure difference change data of the pressure difference sensor when the volume flow rate of the post-processing tank changes by more than a preset degree;

[0074] a correlation determination unit 203, configured to determine a correlation result between the volume flow rate and the pressure difference based on the volume flow rate change data and the pressure difference change data;

[0075] The identification unit 204 is configured to determine that there is an icing risk for the differential pressure sensor if the correlation result indicates that the correlation between the volume flow rate and the pressure difference is less than a preset threshold.

[0076] In some possible implementations, the acquisition unit 202 is specifically used to obtain the volume flow rate corresponding to multiple time points within the preset time period, and to obtain the pressure difference corresponding to multiple time points within the preset time period; the volume flow rate corresponding to the multiple time points is used as the volume flow rate change data, and the pressure difference corresponding to the multiple time points is used as the pressure difference change data.

[0077] In some possible implementations, the correlation determination unit 203 is specifically configured to

[0078]

[0079] Wherein, r represents the correlation result between the volume flow rate and the pressure difference, P i Represents the pressure difference corresponding to the i-th time point among multiple time points, Represents the average pressure difference of multiple pressure differences corresponding to multiple time points, V i represents the volume flow rate corresponding to the i-th time point among multiple time points, Represents the average volume flow rate of multiple pressure differences corresponding to multiple time points.

[0080] In some possible implementations, the identification unit 204 is further used to determine the defrosting temperature and defrosting time corresponding to the correlation coefficient in the correlation result based on a pre-set mapping relationship among the coefficient, temperature, and time; if the temperature of the post-processing box reaches the defrosting temperature and the defrosting time has passed, it is determined that the ice on the differential pressure sensor has melted.

[0081] In some possible implementations, the identification unit 204 is further configured to trigger a regeneration request to increase the temperature of the aftertreatment tank if the temperature of the aftertreatment tank cannot reach the defrosting temperature or cannot last for the defrosting time.

[0082] In some possible implementations, the device further includes a shielding unit, wherein the shielding unit is configured to shield the pressure difference-based fault diagnosis in the post-processing box.

[0083] In some possible implementations, the identification unit 204 is further configured to determine that there is no icing risk for the differential pressure sensor if the correlation result indicates that the correlation between the volume flow and the pressure difference is greater than or equal to the preset threshold.

[0084] The present application also provides a computer-readable storage medium, which is used to store a computer program, and the computer program is used to execute any one of the methods described in the method embodiments.

[0085] The present application also provides a device comprising: a memory and a processor; the memory stores a computer program; the processor is configured to execute the computer program in the memory to implement any one of the methods described in the method embodiments.

[0086] Through the description of the above embodiments, those skilled in the art will clearly understand that for the sake of convenience and brevity, only the division of the above functional modules is used as an example. 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. The specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0087] In the several embodiments provided in this embodiment, it should be understood that the disclosed processing equipment and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0088] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0089] In addition, the functional units in each embodiment of the present invention may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0090] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this embodiment, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the method described in each embodiment. The aforementioned storage medium includes: various media that can store program code, such as flash memory, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk.

[0091] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for identifying icing risk of a differential pressure sensor, characterized in that: The differential pressure sensor is used to detect the pressure difference between the upstream and downstream of the diesel particulate filter (DPF) of the post-treatment system. The method includes: Controlling the volume flow of the post-processing tank to change by more than a preset degree, and acquiring the change data of the volume flow and the change data of the pressure difference of the pressure difference sensor; determining a correlation result between the volume flow rate and the pressure difference based on the volume flow rate change data and the pressure difference change data; If the correlation result indicates that the correlation between the volume flow rate and the pressure difference is less than a preset threshold, determining that the pressure difference sensor has an icing risk; The acquiring of the volume flow rate change data and the pressure difference change data of the pressure difference sensor within a preset time period during which the volume flow rate of the after-treatment tank changes by a greater than preset degree includes: Obtaining the volume flow rate corresponding to multiple time points within the preset time period, and obtaining the pressure difference corresponding to multiple time points within the preset time period; Using the volume flow rates corresponding to the multiple time points as volume flow rate change data, and using the pressure differences corresponding to the multiple time points as pressure difference change data; Determining a correlation result between the volume flow rate and the pressure difference based on the volume flow rate change data and the pressure difference change data includes: Wherein, r represents the correlation result between the volume flow rate and the pressure difference, P i Represents the pressure difference corresponding to the i-th time point among multiple time points, Represents the average pressure difference of multiple pressure differences corresponding to multiple time points, V i represents the volume flow rate corresponding to the i-th time point among multiple time points, Represents the average volume flow rate of multiple pressure differences corresponding to multiple time points.

2. The method according to claim 1, characterized in that The method further comprises: Determining the ice-melting temperature and ice-melting time corresponding to the correlation coefficient in the correlation result according to a preset mapping relationship among the coefficient, temperature, and time; If the temperature of the aftertreatment tank reaches the ice-melting temperature and the ice-melting time period has elapsed, it is determined that the ice on the differential pressure sensor has melted.

3. The method according to claim 2, characterized in that The method further comprises: If the temperature of the aftertreatment tank cannot reach the defrosting temperature or cannot pass the defrosting time, a regeneration request is triggered to increase the temperature of the aftertreatment tank.

4. The method according to claim 1, wherein The method further comprises: Pressure differential-based fault diagnosis in a shielded post-processing box.

5. The method according to claim 1, wherein The method further comprises: If the correlation result indicates that the correlation between the volume flow and the pressure difference is greater than or equal to the preset threshold, it is determined that there is no icing risk for the differential pressure sensor.

6. A device for identifying the icing risk of a differential pressure sensor, characterized in that: The differential pressure sensor is used to detect the pressure difference between the upstream and downstream of the diesel particulate filter DPF of the post-treatment system, and the device includes: a control unit for controlling the volume flow of the aftertreatment tank to change by more than a preset degree; an acquisition unit, configured to acquire volume flow rate change data and pressure difference change data of the pressure difference sensor when the volume flow rate of the post-processing tank changes by more than a preset degree; a correlation determining unit, configured to determine a correlation result between the volume flow rate and the pressure difference based on the change data of the volume flow rate and the change data of the pressure difference; an identification unit, configured to determine that the differential pressure sensor has an icing risk if the correlation result indicates that the correlation between the volume flow rate and the pressure difference is less than a preset threshold; The acquisition unit is specifically configured to acquire the volume flow rates corresponding to a plurality of time points within the preset time period, and acquire the pressure differences corresponding to a plurality of time points within the preset time period; use the volume flow rates corresponding to the plurality of time points as the volume flow rate change data, and use the pressure differences corresponding to the plurality of time points as the pressure difference change data; The correlation determination unit is specifically configured to: Wherein, r represents the correlation result between the volume flow rate and the pressure difference, P i Represents the pressure difference corresponding to the i-th time point among multiple time points, Represents the average pressure difference of multiple pressure differences corresponding to multiple time points, V i represents the volume flow rate corresponding to the i-th time point among multiple time points, Represents the average volume flow rate of multiple pressure differences corresponding to multiple time points.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store a computer program, and the computer program is used to execute the method according to any one of claims 1 to 5.

8. A device, characterized in that include: memory and processor; The memory stores a computer program; The processor is configured to execute the computer program in the memory to implement the method according to any one of claims 1 to 5.

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