Vehicle desorption flow detection method and device, electronic equipment and storage medium

Abstract

The application provides a vehicle desorption flow detection method and device, electronic equipment and a computer readable storage medium. The method comprises the following steps: obtaining a vehicle state of a vehicle; detecting whether the vehicle state reaches a target state; if the vehicle state is in the target state, monitoring a real-time tank pressure of the vehicle; obtaining a corresponding relationship between the tank pressure and a diagnosis strategy; determining a corresponding target diagnosis strategy based on the real-time tank pressure and the corresponding relationship; and performing desorption flow detection on the vehicle based on the target diagnosis strategy. Through the application, automatic desorption flow detection can be performed without affecting the driving of the vehicle.

Description

Technical Field

[0001] This application relates to vehicle detection technology, and more particularly to a method, apparatus, electronic device, and computer-readable storage medium for detecting the desorption flow rate of a vehicle. Background Technology

[0002] Current desorption diagnostic methods are generally active interventional diagnostics, and can only be performed under idling conditions. Because they heavily rely on the fuel tank pressure sensor, the diagnostic process fails to account for pressure inaccuracies caused by the sensor being submerged, and lacks zero-point learning calibration for fuel tank pressure. This results in a high probability of false alarms. Since it's an interventional diagnostic method and must be performed under idling conditions, an idling operating point must be introduced for hybrid vehicles. When the state of charge (SOC) is high and charging is not required, performing the diagnostics may increase fuel consumption and negatively impact the driving experience. Summary of the Invention

[0003] This application provides a method, apparatus, electronic device, and computer-readable storage medium for detecting desorption flow in a vehicle, which can automatically detect desorption flow without affecting vehicle operation.

[0004] The technical solution of this application embodiment is implemented as follows:

[0005] This application provides a method for detecting the desorption flow rate of a vehicle, including:

[0006] Obtain the vehicle's status;

[0007] Detect whether the vehicle status has reached the target status;

[0008] If the vehicle is in the target state, monitor the real-time fuel tank pressure of the vehicle;

[0009] Obtain the correlation between tank pressure and diagnostic strategies;

[0010] Based on the real-time tank pressure and the corresponding relationship, a corresponding target diagnostic strategy is determined;

[0011] The vehicle is subjected to desorption flow detection based on the target diagnostic strategy.

[0012] In the above scheme, the vehicle status includes the engine status and the fuel tank level, and the target status includes the engine status being in operation and the fuel tank level being lower than the target level.

[0013] In the above scheme, the vehicle state also includes ambient temperature and engine coolant temperature. The target state includes the ambient temperature being in a first temperature range, the engine coolant temperature being in a second temperature range, and the temperature difference between the ambient temperature and the engine coolant temperature being less than or equal to a temperature difference threshold.

[0014] In the above scheme, the vehicle state also includes the fuel state, and the target state includes the fuel state representing that the fuel is in a sloshing state and has reached a target time.

[0015] In the above scheme, detecting whether the vehicle state has reached the target state includes:

[0016] Read the first resistance of the oil tank level sensor;

[0017] Obtain the second resistance of the oil tank level sensor after low-pass filtering;

[0018] If the absolute value of the difference between the first resistor and the second resistor is greater than the resistance threshold, then the fuel is determined to be in a sloshing state.

[0019] Continue monitoring the first resistor and the second resistor to determine the duration of the fuel being in the sloshing state;

[0020] If the duration reaches the target time, then the vehicle state is determined to have reached the target state.

[0021] In the above scheme, determining the corresponding target diagnostic strategy based on the real-time tank pressure and the corresponding relationship includes:

[0022] Obtain intake manifold pressure and ambient pressure;

[0023] Based on the intake manifold pressure, ambient pressure, real-time fuel tank pressure, and the corresponding relationship, a corresponding target diagnostic strategy is determined.

[0024] In the above scheme, determining the corresponding target diagnostic strategy based on the intake manifold pressure, ambient pressure, real-time fuel tank pressure, and the corresponding relationship includes:

[0025] If the intake manifold pressure is lower than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a first pressure value, then the diagnostic target is determined to be low desorption flow.

[0026] Based on the real-time tank pressure and the corresponding relationship, a target diagnostic strategy for the low desorption flow rate is determined.

[0027] If the intake manifold pressure is higher than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than the second pressure value, then the diagnostic target is determined to be high desorption flow rate.

[0028] Based on the real-time tank pressure and the corresponding relationship, a target diagnostic strategy for the high desorption flow rate is determined.

[0029] This application provides a vehicle desorption flow detection device, comprising:

[0030] The first acquisition module is used to acquire the vehicle status;

[0031] The status detection module is used to detect whether the vehicle status has reached the target status;

[0032] The monitoring module is used to monitor the real-time fuel tank pressure of the vehicle if the vehicle is in the target state.

[0033] The second acquisition module is used to obtain the correspondence between the tank pressure and the diagnostic strategy;

[0034] The determination module is used to determine the corresponding target diagnostic strategy based on the real-time tank pressure and the corresponding relationship;

[0035] The flow detection module is used to detect the desorption flow of the vehicle based on the target diagnostic strategy.

[0036] This application provides an electronic device, including:

[0037] Memory, used to store executable instructions;

[0038] The processor, when executing executable instructions stored in the memory, implements the vehicle desorption flow detection method provided in the embodiments of this application.

[0039] This application provides a computer-readable storage medium storing executable instructions for inducing a processor to execute and implement the vehicle desorption flow detection method provided in this application.

[0040] This application embodiment obtains the vehicle status, detects whether the vehicle status has reached a target status, and if the vehicle status is in the target status, monitors the real-time fuel tank pressure of the vehicle, obtains the correspondence between the fuel tank pressure and the diagnostic strategy, determines the corresponding target diagnostic strategy based on the real-time fuel tank pressure and the correspondence, and performs desorption flow detection on the vehicle based on the target diagnostic strategy. The desorption flow detection can be performed automatically without affecting the driving of the vehicle. Attached Figure Description

[0041] Figure 1This is an optional structural schematic diagram of the vehicle desorption flow detection system provided in the embodiments of this application;

[0042] Figure 2 This is an optional structural schematic diagram of the electronic device provided in an embodiment of this application;

[0043] Figure 3 This is an optional flowchart illustrating the vehicle desorption flow detection method provided in this application embodiment;

[0044] Figure 4 This is an optional flowchart illustrating the low desorption diagnostic process provided in an embodiment of this application. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0047] In the following description, the terms "first, second, third" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0049] This application provides a method, apparatus, electronic device, and computer-readable storage medium for detecting desorption flow in a vehicle, which can automatically detect desorption flow without affecting vehicle driving.

[0050] First, the vehicle desorption flow detection system provided in the embodiments of this application will be described, see [link to relevant documentation]. Figure 1 , Figure 1This is an optional structural diagram of a vehicle desorption flow detection system provided in this application embodiment. The vehicle desorption flow detection system includes an engine control unit (ECU) 101 and an evaporation leakage system 102.

[0051] The electronic device for implementing the above-described vehicle desorption flow detection method, as provided in the embodiments of this application, will now be described. See [link to relevant documentation]. Figure 2 , Figure 2 This is an optional structural diagram of the electronic device 200 provided in this application embodiment. In practical applications, the electronic device 200 can be implemented as follows: Figure 1 The ECU101 in the present application is described below as an electronic device for implementing the vehicle desorption flow detection method according to the embodiments of this application.

[0052] Figure 2 The illustrated electronic device 200 includes at least one processor 201 and a memory 202. Various components within the electronic device 200 are coupled together via a bus system 203. It is understood that the bus system 203 is used to implement communication between these components. In addition to a data bus, the bus system 203 also includes a power bus, a control bus, and a status signal bus. However, for clarity, ... Figure 2 The general designated all buses as Bus System 203.

[0053] Processor 201 can be an integrated circuit chip with signal processing capabilities, such as a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor can be a microprocessor or any conventional processor, etc.

[0054] The memory 202 may be removable, non-removable, or a combination thereof. Exemplary hardware devices include solid-state storage, hard disk drives, optical disk drives, etc. The memory 202 may optionally include one or more storage devices physically located away from the processor 201.

[0055] The memory 202 may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), and the volatile memory may be random access memory (RAM). The memory 202 described in this application embodiment is intended to include any suitable type of memory.

[0056] In some embodiments, the memory 202 is capable of storing data to support various operations. Examples of such data include programs, modules, and data structures, or subsets or supersets thereof. In this embodiment, the memory 202 stores an operating system 2021 and an information configuration device 2022 based on a multi-configuration storage communication device; specifically,

[0057] Operating System 2021 includes system programs for handling various basic system services and performing hardware-related tasks, such as the framework layer, core library layer, and driver layer, which are used to implement various basic business functions and handle hardware-based tasks.

[0058] In some embodiments, the information configuration device based on a multi-configuration storage communication device provided in this application can be implemented in software. Figure 2 An information configuration device 2022 based on a multi-configuration storage communication device, stored in memory 202, is shown. This device can be software in the form of programs and plug-ins, and includes the following software modules: a first acquisition module 20221, a status detection module 20222, a monitoring module 20223, a second acquisition module 20224, a determination module 20225, and a flow detection module 20226. These modules are logically linked and can therefore be arbitrarily combined or further divided according to their implemented functions. The functions of each module will be described below.

[0059] In other embodiments, the information configuration device based on a multi-configuration storage communication device provided in this application can be implemented in hardware. As an example, the information configuration device based on a multi-configuration storage communication device provided in this application can be a processor in the form of a hardware decoding processor, which is programmed to execute the information configuration method based on a multi-configuration storage communication device provided in this application. For example, the processor in the form of a hardware decoding processor can be one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), or other electronic components.

[0060] The following will describe the vehicle desorption flow detection method provided in this application embodiment, with reference to the exemplary application and implementation of the terminal provided in the embodiments of this application.

[0061] See Figure 3 , Figure 3This is an optional flowchart illustrating the vehicle desorption flow detection method provided in this application embodiment, which will be combined with... Figure 3 The steps shown are explained.

[0062] Step 301: Obtain the vehicle status;

[0063] Step 302: Detect whether the vehicle state has reached the target state;

[0064] Step 303: If the vehicle is in the target state, monitor the real-time fuel tank pressure of the vehicle;

[0065] Step 304: Obtain the correspondence between tank pressure and diagnostic strategy;

[0066] Step 305: Based on the real-time tank pressure and the corresponding relationship, determine the corresponding target diagnostic strategy;

[0067] Step 306: Detect the desorption flow rate of the vehicle based on the target diagnostic strategy.

[0068] In some embodiments, the vehicle status includes engine status and fuel tank level, and the target status includes the engine status being in operation and the fuel tank level being below a target level.

[0069] In some embodiments, the vehicle state further includes ambient temperature and engine coolant temperature, and the target state includes the ambient temperature being in a first temperature range, the engine coolant temperature being in a second temperature range, and the temperature difference between the ambient temperature and the engine coolant temperature being less than or equal to a temperature difference threshold.

[0070] In some embodiments, the vehicle state further includes the fuel state, and the target state includes the fuel state representing that the fuel is in a sloshing state and has reached a target time.

[0071] In some embodiments, detecting whether the vehicle state has reached a target state includes:

[0072] Read the first resistance of the oil tank level sensor;

[0073] Obtain the second resistance of the oil tank level sensor after low-pass filtering;

[0074] If the absolute value of the difference between the first resistor and the second resistor is greater than the resistance threshold, then the fuel is determined to be in a sloshing state.

[0075] Continue monitoring the first resistor and the second resistor to determine the duration of the fuel being in the sloshing state;

[0076] If the duration reaches the target time, then the vehicle state is determined to have reached the target state.

[0077] In some embodiments, determining the corresponding target diagnostic strategy based on the real-time tank pressure and the corresponding relationship includes:

[0078] Obtain intake manifold pressure and ambient pressure;

[0079] Based on the intake manifold pressure, ambient pressure, real-time fuel tank pressure, and the corresponding relationship, a corresponding target diagnostic strategy is determined.

[0080] In some embodiments, determining the corresponding target diagnostic strategy based on the intake manifold pressure, ambient pressure, real-time fuel tank pressure, and the corresponding relationship includes:

[0081] If the intake manifold pressure is lower than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a first pressure value, then the diagnostic target is determined to be low desorption flow.

[0082] Based on the real-time tank pressure and the corresponding relationship, a target diagnostic strategy for the low desorption flow rate is determined.

[0083] If the intake manifold pressure is higher than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than the second pressure value, then the diagnostic target is determined to be high desorption flow rate.

[0084] Based on the real-time tank pressure and the corresponding relationship, a target diagnostic strategy for the high desorption flow rate is determined.

[0085] In this embodiment, the vehicle status is obtained, and it is detected whether the vehicle status has reached the target status. If the vehicle status is in the target status, the real-time fuel tank pressure of the vehicle is monitored to obtain the correspondence between the fuel tank pressure and the diagnostic strategy. Based on the real-time fuel tank pressure and the correspondence, the corresponding target diagnostic strategy is determined. Based on the target diagnostic strategy, the vehicle is desorption flow detection is performed automatically without affecting the driving of the vehicle.

[0086] The following will describe an exemplary application of the embodiments of this application in a real-world application scenario.

[0087] This application embodiment employs a passive diagnostic method, performing diagnosis continuously throughout a driving cycle. Diagnosis is based on a comprehensive assessment of changes in fuel tank pressure. To improve diagnostic accuracy, several diagnostic conditions are set: the engine is running; the fuel tank level is below 85%; the ambient temperature and engine coolant temperature are both between 4 and 35 degrees Celsius, with a temperature difference not exceeding 7 degrees Celsius; relevant sensors are free from any faults interfering with the diagnosis; no severe fuel slosh is detected; the canister purge solenoid valve itself is functioning correctly, and no other faults affect its closure; the low desorption condition requires the intake manifold pressure to be at least 15 kPa lower than the local ambient pressure; the high desorption condition requires the intake manifold pressure to be at least 30 kPa higher than the local ambient pressure; and the canister purge solenoid valve duty cycle (PUCO duty) is greater than 35%.

[0088] This application provides a diagnostic system for insufficient high and low desorption, which includes an engine control unit (ECU) and related components of an evaporation leakage system. The specific implementation method will be explained in detail below.

[0089] Step 1: Diagnostic Preparation Phase. This invention relies on fuel tank pressure for judgment, and an abnormal shutdown of the CCV during the diagnostic process will affect the fuel tank pressure judgment. Therefore, it is necessary to first ensure that the CCV and fuel tank pressure sensor are in good condition. During the power-on phase, the ECU will actively switch the CCV on and off twice for self-learning to ensure that the CCV is not stuck. At the same time, other related components are monitored for wiring faults. After the hybrid vehicle is powered on, the fuel tank pressure sensor is trained to zero drift to confirm that the fuel tank pressure sensor is accurate.

[0090] Step two: During vehicle operation, when the hybrid vehicle enters a suitable series or parallel operating condition, the engine will start. At this time, the ECU will determine whether it can enter the diagnostic process based on a series of conditions set earlier, such as temperature, manifold pressure, and carbon canister solenoid valve duty cycle, and monitor the desorption flow.

[0091] Specifically, the fuel tank pressure is monitored first. If the fuel tank pressure Fuel Tank Press ≤ m0 (negative pressure, the pressure that can be reached under normal desorption conditions), the pass counter increases; if the fuel tank pressure Fuel Tank Press > m0, the fail counter increases. This monitoring method is continuously performed within one driving cycle, with high or low desorption counters calculated separately.

[0092] Next, when the low desorption pass counter reaches the specified limit (A), the low desorption diagnosis is complete, and the low desorption operation is considered normal. When the low desorption fail counter reaches the specified limit (B), the low desorption diagnosis is complete, and the low desorption operation is considered to have insufficient desorption. Similarly, when the high desorption pass counter reaches the specified limit (A), the high desorption diagnosis is complete, and the high desorption operation is considered normal. When the low desorption fail counter reaches the specified limit (B), the high desorption diagnosis is complete, and the high desorption operation is considered to have insufficient desorption.

[0093] In practical implementation, to eliminate false alarms, this invention specifies different rules for the counter, as follows:

[0094] First, during the diagnostic process, different tank pressures correspond to different effective counts, as shown in the table below: m0 > m1 > m2 > ... > m8; (all pressure values ​​are negative).

[0095] Second, when the oil tank pressure is between m1 and m0, the pass counter increments by 1 each time; when the oil tank pressure is between m2 and m1, the pass counter increments by 2 each time, and so on.

[0096]

[0097] Third, regarding the fail counter, during the diagnostic process, if the tank pressure exceeds the limit m0, the fail counter will only increment by 1 each time.

[0098] Fourth, the principle of high desorption is the same as that of low desorption counters mentioned above.

[0099] See Figure 4 , Figure 4 This is an optional flowchart of the low desorption diagnostic process provided in this application embodiment; the high desorption diagnostic process is the same as the low desorption process. Since fuel slosh can flood the fuel tank pressure sensor, causing interference with fuel pressure and leading to misjudgments in the diagnostic results, it is essential to accurately identify fuel slosh. Once fuel slosh occurs, the diagnostic process must be terminated. The fuel slosh detection method is as follows: Step 1: The ECU obtains the original sensor resistance Ra from the fuel tank level sensor, and then obtains the filtered sensor resistance Rb through a low-pass filter. |Ra-Rb|>ΔR=(15Ω), indicating that severe fuel sloshing has been detected. Step 2: The original sensor resistance Ra is read from the fuel tank level sensor, and then the filtered sensor resistance Rb is obtained through a low-pass filter. Fuel slosh and its duration at different levels are obtained from a large amount of experimental data. If |Ra-Rb|>Rx is detected at a certain fuel level X%, and the sloshing time reaches Tx or more, severe fuel tank sloshing is considered to have been detected.

[0100]

[0101] This application embodiment requires no new hardware, relying entirely on the existing evaporation system structure to diagnose insufficient desorption flow. Furthermore, this strategy eliminates the need for an additional high desorption pressure sensor, saving on hardware costs that might be required in other implementations. This application embodiment also considers fuel tank protection and introduces a fuel sloshing detection method, which can be extended to other evaporation system diagnoses, such as fuel tank cap detachment diagnosis or fuel tank pressure sensor zero-point learning diagnosis, increasing the accuracy of these diagnoses. The diagnostic process employs reasonable fault counter rules, deriving pass count values ​​under different pressures from extensive experimental data, significantly reducing the possibility of false alarms.

[0102] The following description continues to illustrate the exemplary structure of the vehicle desorption flow detection device 2022 provided in this application embodiment as a software module. In some embodiments, such as... Figure 2 As shown, the software module in the vehicle desorption flow detection device 2022 stored in memory 202 may include:

[0103] The first acquisition module 20221 is used to acquire the vehicle status;

[0104] The status detection module 20222 is used to detect whether the vehicle status has reached the target status;

[0105] The monitoring module 20223 is used to monitor the real-time fuel tank pressure of the vehicle if the vehicle is in the target state.

[0106] The second acquisition module 20224 is used to obtain the correspondence between the tank pressure and the diagnostic strategy;

[0107] The determination module 20225 is used to determine the corresponding target diagnostic strategy based on the real-time oil tank pressure and the corresponding relationship;

[0108] The flow detection module 20226 is used to perform desorption flow detection on the vehicle based on the target diagnostic strategy.

[0109] In some embodiments, the vehicle status includes engine status and fuel tank level, and the target status includes the engine status being in operation and the fuel tank level being below a target level.

[0110] In some embodiments, the vehicle state further includes ambient temperature and engine coolant temperature, and the target state includes the ambient temperature being in a first temperature range, the engine coolant temperature being in a second temperature range, and the temperature difference between the ambient temperature and the engine coolant temperature being less than or equal to a temperature difference threshold.

[0111] In some embodiments, the vehicle state further includes the fuel state, and the target state includes the fuel state representing that the fuel is in a sloshing state and has reached a target time.

[0112] In some embodiments, the state detection module is further configured to: read the first resistance of the fuel tank level sensor; obtain the second resistance of the fuel tank level sensor after low-pass filtering; if the absolute value of the difference between the first resistance and the second resistance is greater than a resistance threshold, determine that the fuel is in a sloshing state; continue to monitor the first resistance and the second resistance to determine the duration of the fuel being in the sloshing state; if the duration reaches the target time, determine that the vehicle state has reached the target state.

[0113] In some embodiments, the determining module is further configured to obtain intake manifold pressure and ambient pressure; and to determine a corresponding target diagnostic strategy based on the intake manifold pressure, ambient pressure, real-time fuel tank pressure and the corresponding relationship.

[0114] In some embodiments, the determining module is further configured to: determine the diagnostic target as low desorption flow rate if the intake manifold pressure is lower than the ambient pressure and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a first pressure value; determine a target diagnostic strategy for the low desorption flow rate based on the real-time tank pressure and the corresponding relationship; determine the diagnostic target as high desorption flow rate if the intake manifold pressure is higher than the ambient pressure and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a second pressure value; and determine a target diagnostic strategy for the high desorption flow rate based on the real-time tank pressure and the corresponding relationship.

[0115] It should be noted that the description of the apparatus in this application embodiment is similar to the description of the method embodiment above, and has similar beneficial effects as the method embodiment, so it will not be repeated.

[0116] This application provides a computer program product or computer program that includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the vehicle detachment flow detection method described in this application embodiment.

[0117] This application provides a computer-readable storage medium storing executable instructions, wherein the executable instructions are executed by a processor, causing the processor to execute the vehicle detachment flow detection method provided in this application.

[0118] In some embodiments, the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface memory, optical disk, or CD-ROM; or it may be a variety of devices including one or any combination of the above-mentioned memories.

[0119] In some embodiments, executable instructions may take the form of a program, software, software module, script, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a standalone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.

[0120] As an example, executable instructions may, but do not necessarily, correspond to files in a file system. They may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a Hyper Text Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple collaborating files (e.g., a file that stores one or more modules, subroutines, or code sections).

[0121] As an example, executable instructions can be deployed to execute on a single computing device, or on multiple computing devices located in one location, or on multiple computing devices distributed across multiple locations and interconnected via a communication network.

[0122] In summary, the embodiments of this application can automatically detect desorption flow without affecting vehicle operation.

[0123] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. A method for detecting the desorption flow rate of a vehicle, characterized in that, include: Obtain the vehicle's status; Detect whether the vehicle status has reached the target status; If the vehicle is in the target state, monitor the real-time fuel tank pressure of the vehicle; Obtain the correlation between tank pressure and diagnostic strategies; Based on the real-time tank pressure and the corresponding relationship, a corresponding target diagnostic strategy is determined; Desorption flow rate is detected in the vehicle based on the target diagnostic strategy. The step of determining the corresponding target diagnostic strategy based on real-time tank pressure and the corresponding relationship includes: Obtain intake manifold pressure and ambient pressure; If the intake manifold pressure is lower than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a first pressure value, then the diagnostic target is determined to be low desorption flow. Based on the real-time tank pressure and the corresponding relationship, a target diagnostic strategy for the low desorption flow rate is determined. If the intake manifold pressure is higher than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than the second pressure value, then the diagnostic target is determined to be high desorption flow rate. Based on the real-time tank pressure and the corresponding relationship, a target diagnostic strategy for the high desorption flow rate is determined.

2. The method according to claim 1, characterized in that, The vehicle status includes engine status and fuel tank level, and the target status includes the engine being in operation and the fuel tank level being below the target level.

3. The method according to claim 2, characterized in that, The vehicle status also includes ambient temperature and engine coolant temperature. The target status includes the ambient temperature being in a first temperature range, the engine coolant temperature being in a second temperature range, and the temperature difference between the ambient temperature and the engine coolant temperature being less than or equal to a temperature difference threshold.

4. The method according to claim 2, characterized in that, The vehicle status also includes the fuel status, and the target status includes the fuel status representing that the fuel is in a sloshing state and has reached a target time.

5. The method according to claim 4, characterized in that, The detection of whether the vehicle state has reached the target state includes: Read the first resistance of the oil tank level sensor; Obtain the second resistance of the oil tank level sensor after low-pass filtering; If the absolute value of the difference between the first resistor and the second resistor is greater than the resistance threshold, then the fuel is determined to be in a sloshing state. Continue monitoring the first resistor and the second resistor to determine the duration of the fuel being in the sloshing state; If the duration reaches the target time, then the vehicle state is determined to have reached the target state.

6. A vehicle desorption flow detection device, characterized in that, include: The first acquisition module is used to acquire the vehicle status; The status detection module is used to detect whether the vehicle status has reached the target status; The monitoring module is used to monitor the real-time fuel tank pressure of the vehicle if the vehicle is in the target state. The second acquisition module is used to obtain the correspondence between the tank pressure and the diagnostic strategy; The determination module is used to determine the corresponding target diagnostic strategy based on the real-time tank pressure and the corresponding relationship; The flow detection module is used to detect the desorption flow of the vehicle based on the target diagnostic strategy; The determining module is further configured to obtain intake manifold pressure and ambient pressure; if the intake manifold pressure is lower than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a first pressure value, then the diagnostic target is determined to be low desorption flow; based on the real-time fuel tank pressure and the corresponding relationship, a target diagnostic strategy for the low desorption flow is determined; if the intake manifold pressure is higher than the ambient pressure, and the absolute value of the pressure difference between the intake manifold pressure and the ambient pressure is greater than a second pressure value, then the diagnostic target is determined to be high desorption flow; based on the real-time fuel tank pressure and the corresponding relationship, a target diagnostic strategy for the high desorption flow is determined.

7. An electronic device, characterized in that, include: Memory, used to store executable instructions; The processor, when executing executable instructions stored in the memory, implements the vehicle desorption flow detection method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, It stores executable instructions for implementing the vehicle desorption flow detection method according to any one of claims 1 to 5 when executed by a processor.

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