Fuel evaporation leakage diagnosis method and device, vehicle and storage medium

Abstract

The invention relates to a fuel evaporation leakage diagnosis method and device, a vehicle and a storage medium. According to the method, a fuel evaporation leakage diagnosis system is adopted and comprises a first on-off valve arranged between an engine intake manifold and a first end of an activated carbon canister, a second on-off valve arranged between a carbon canister ash filter and a second end of the activated carbon canister, and a pressure sensor arranged between a fuel tank and a third end of the activated carbon canister, the method comprises: acquiring a current working condition of a vehicle; if the current working condition is the preset stable working condition, the first on-off valve and the second on-off valve are controlled to be in a normally-closed state, and the current oil pressure change value of the pressure sensor is obtained; and if the current oil pressure change value is not in the preset oil pressure change interval, it is judged that fuel evaporation leakage exists. Therefore, by using the two-way check valve and the pressure sensor, the fuel evaporation leakage can be diagnosed at any time, the problems that in the prior art, the cost is high, and the fuel evaporation leakage is limited by the vehicle working condition and the external environment are solved, and the applicability is enhanced.

Description

Technical Field

[0001] The present application relates to the field of fuel vehicle control technology, and in particular to a fuel evaporation leakage diagnosis method, device, vehicle and storage medium. Background Art

[0002] With the development of industry and technology, especially the rapid rise of the automobile industry, the impact of industrial waste gas and automobile exhaust on the environment has become increasingly severe. In order to further reduce and limit automobile exhaust pollution, the state has issued GB18532-2016 Light Vehicle Pollutant Emission Limits and Measurement Methods, which has made strict requirements on automobile emissions. The National VI Emission Regulations have added requirements for fuel evaporation system diagnosis, requiring that the OBD (On-Board Diagnostics, on-board automatic diagnostic system) on-board diagnostic system should have the ability to monitor evaporation system leaks of 1mm and above, and the IUPR (In-UsePerformance Ratio, the monitoring frequency of the vehicle-related OBD monitoring function) rate should meet 0.226.

[0003] In the related technologies, the solutions adopted by domestic OEMs for vehicle fuel evaporation system diagnosis are mostly based on DMTL (Diagnostic Module Tank Leakage). DMTL is an external evaporation system leakage monitoring module. Its detection principle is to pump air into the fuel tank system through an air pump to increase the fuel tank pressure. The size of the air pump current indirectly reflects the increase in the fuel tank pressure, thereby determining whether there is a leak in the system.

[0004] However, this method requires an additional fuel leak diagnosis module, which increases the cost of the entire vehicle. In addition, the DMTL requires stable operating conditions when forming a 0.5mm leakage hole reference current, and needs to be run after the vehicle is powered off for diagnosis. That is, it is limited by the vehicle operating conditions and / or the external environment, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a fuel evaporation leakage diagnosis method, device, vehicle and storage medium to solve the problems of high cost of the prior art and being limited by vehicle operating conditions and external environment, thereby enhancing applicability.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application provides a fuel evaporation leakage diagnosis method, the method adopts a fuel evaporation leakage diagnosis system, the fuel evaporation leakage diagnosis system includes a first check valve arranged between the engine intake manifold and the first end of the activated carbon canister, a second check valve arranged between the carbon canister ash filter and the second end of the activated carbon canister, and a pressure sensor arranged between the fuel tank and the third end of the activated carbon canister, wherein the method includes the following steps:

[0007] Get the current working condition of the vehicle;

[0008] If the current working condition is a preset stable working condition, the first stop valve and the second stop valve are controlled to be in a normally closed state, and a current oil pressure change value of the pressure sensor is obtained;

[0009] If the current oil pressure change value is not within the preset oil pressure change range, it is determined that there is a fuel evaporation leakage.

[0010] Through the above-mentioned technical means, by using a two-way check valve and a pressure sensor, fuel evaporation leakage can be diagnosed at any time, which solves the problem that the existing technology is high in cost and is limited by vehicle operating conditions and external environment, and enhances its applicability.

[0011] According to one embodiment of the present application, after obtaining the current working condition of the vehicle, the method further includes:

[0012] If the current operating condition is not the preset stable operating condition, determining whether the engine of the vehicle is in a working state;

[0013] If the engine is in the working state, the first on-off valve and the second on-off valve are controlled to be in an open state, and the activated carbon canister is flushed and desorbed.

[0014] Through the above-mentioned technical means, it is possible to flexibly respond to different vehicle operating conditions and operation modes, ensuring the effectiveness and reliability of the fuel evaporation system.

[0015] According to one embodiment of the present application, after obtaining the current working condition of the vehicle, the method further includes:

[0016] If the current operating condition is not the preset stable operating condition, determining whether the vehicle is in a refueling mode;

[0017] If the vehicle is in the refueling mode, the second on-off valve is controlled to be in an open state.

[0018] Through the above-mentioned technical means, it is possible to flexibly respond to different vehicle operating conditions and operation modes, ensuring the effectiveness and reliability of the fuel evaporation system.

[0019] According to an embodiment of the present application, when determining that there is a fuel evaporation leakage, the method further includes:

[0020] Determine the duration of time during which the current oil pressure change value is not within the preset oil pressure change range;

[0021] If the duration is longer than a preset duration, it is determined that there is a fuel evaporation leak.

[0022] Through the above-mentioned technical means, by increasing the judgment of the duration of the oil pressure change value not being in the preset range, the fuel evaporation leakage problem can be identified more accurately and the possibility of misjudgment and missed judgment can be reduced.

[0023] According to an embodiment of the present application, after determining that there is a fuel evaporation leakage, the method further includes:

[0024] Generate a fuel leak alarm signal;

[0025] An alarm is issued based on the fuel leakage alarm signal.

[0026] Through the above technical means, it is convenient to remind users in time to control the vehicle accordingly to improve the safety of the vehicle.

[0027] According to the fuel evaporation leakage diagnosis method proposed in the embodiment of the present application, the current working condition of the vehicle is obtained, and when the current working condition is a preset stable working condition, the first check valve and the second check valve are controlled to be in a normally closed state, and the current oil pressure change value of the pressure sensor is obtained; and when the current oil pressure change value is not in the preset oil pressure change range, it is determined that there is a fuel evaporation leakage. Therefore, by using a double check valve and a pressure sensor, fuel evaporation leakage can be diagnosed at any time, which solves the problem that the existing technology is high in cost and is limited by vehicle working conditions and external environment, and enhances applicability.

[0028] To achieve the above-mentioned purpose, the second embodiment of the present application provides a fuel evaporation leakage diagnostic device, wherein the device adopts a fuel evaporation leakage diagnostic system, wherein the fuel evaporation leakage diagnostic system comprises a first on-off valve disposed between an engine intake manifold and a first end of an activated carbon canister, a second on-off valve disposed between a carbon canister ash filter and a second end of the activated carbon canister, and a pressure sensor disposed between a fuel tank and a third end of the activated carbon canister, wherein the device comprises:

[0029] An acquisition module, used to acquire the current working condition of the vehicle;

[0030] a control module, configured to control the first stop valve and the second stop valve to be in a normally closed state when the current working condition is a preset stable working condition, and to obtain a current oil pressure change value of the pressure sensor;

[0031] The determination module is used to determine the presence of fuel evaporation leakage when the current oil pressure change value is not within a preset oil pressure change interval.

[0032] According to one embodiment of the present application, after acquiring the current operating condition of the vehicle, the acquisition module is further used to:

[0033] When the current operating condition is not the preset stable operating condition, determining whether the engine of the vehicle is in a working state;

[0034] When the engine is in the working state, the first on-off valve and the second on-off valve are controlled to be in an open state, and the activated carbon canister is flushed and desorbed.

[0035] According to one embodiment of the present application, after acquiring the current operating condition of the vehicle, the acquisition module is further used to:

[0036] When the current operating condition is not the preset stable operating condition, determining whether the vehicle is in a refueling mode;

[0037] When the vehicle is in the refueling mode, the second on-off valve is controlled to be in an open state.

[0038] According to an embodiment of the present application, when it is determined that there is a fuel evaporation leakage, the determination module is further used to:

[0039] Determine the duration of time during which the current oil pressure change value is not within the preset oil pressure change range;

[0040] If the duration is longer than a preset duration, it is determined that there is a fuel evaporation leak.

[0041] According to an embodiment of the present application, after determining that there is a fuel evaporation leakage, the determination module is further configured to:

[0042] Generate a fuel leak alarm signal;

[0043] An alarm is issued based on the fuel leakage alarm signal.

[0044] According to the fuel evaporation leakage diagnosis device proposed in the embodiment of the present application, the current working condition of the vehicle is obtained, and when the current working condition is a preset stable working condition, the first check valve and the second check valve are controlled to be in a normally closed state, and the current oil pressure change value of the pressure sensor is obtained; and when the current oil pressure change value is not in the preset oil pressure change range, it is determined that there is a fuel evaporation leakage. Therefore, by using a double check valve and a pressure sensor, the fuel evaporation leakage can be diagnosed at any time, which solves the problem that the existing technology is high in cost and is limited by the vehicle working condition and the external environment, and enhances applicability.

[0045] To achieve the above objectives, the third aspect of the present application proposes a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the fuel evaporation leakage diagnosis method as described in the above embodiments.

[0046] To achieve the above objectives, a fourth aspect of the present application provides a computer-readable storage medium on which a computer program is stored. The program is executed by a processor to implement the fuel evaporation leakage diagnosis method as described in the above embodiments.

[0047] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0049] Figure 1 A flowchart of a fuel evaporation leakage diagnosis method provided according to an embodiment of the present application;

[0050] Figure 2 A schematic diagram of the structure of a fuel evaporation leakage diagnostic system according to an embodiment of the present application;

[0051] Figure 3 A schematic block diagram of a fuel evaporation leakage diagnostic device provided according to an embodiment of the present application;

[0052] Figure 4 It is a schematic diagram of the structure of a vehicle provided according to an embodiment of the present application.

[0053] Description of the reference numerals: 1-fuel tank cap, 2-fueling pipe main pipe, 3-fuel tank, 4-ICV (Inlet Control Valve, fueling one-way valve) valve, 5-GVV (Gas Venting Valve, fuel tank vent valve) valve, 6-first vent pipe, 7-fueling pipe circulation pipe, 8-oil-gas separator, 9-second vent pipe, 10-FLVV (Fill Limit Vent Valve, refueling limit venting valve, 11-fuel pump with oil level sensor assembly, 12-first adsorption tube, 13-pressure sensor, 14-second adsorption tube, 15-activated carbon canister, 16-first desorption tube, 17-first on-off valve, 18-second desorption tube, 19-engine intake manifold, 20-air pipe, 21-second on-off valve, 22-carbon canister ash filter, 23-fuel delivery pipeline, 24-high-pressure fuel rail; 30-fuel evaporation leakage diagnostic device, 100-acquisition module, 200-control module, 300-determination module; 401-memory, 402-processor, 403-communication interface. DETAILED DESCRIPTION

[0054] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0055] The following describes a fuel evaporation leakage diagnosis method, device, vehicle, and storage medium according to an embodiment of the present application with reference to the accompanying drawings.

[0056] Figure 1 This is a flow chart of a fuel evaporation leak diagnosis method according to an embodiment of the present application.

[0057] Before introducing the fuel evaporation leakage diagnosis method proposed in the embodiment of the present application, the relevant technical background is briefly introduced.

[0058] In the related technology, most OEMs apply the DMTL solution to the fuel evaporation leak diagnostic system for passenger cars. During detection, an external air pump is used to pump air into the fuel evaporation system. This can increase the pressure in the system when the vehicle is turned off. By monitoring the air pump current when the fuel tank pressure reaches a certain value, the pressure change in the fuel evaporation system is indirectly reflected, thereby determining whether there is a leak in the system.

[0059] Due to the high cost of the DMTL solution and the high failure rate of the air pump, the entire DMTL module has stringent requirements on layout and is easily affected by the external environment when in use, resulting in functional failure or false alarms. The DMTL air pump generates noise when parked and has shortcomings such as power consumption. Now domestic OEMs are gradually coordinating the DTESK solution, adding a charcoal canister ventilation stop valve to the atmospheric end of the charcoal canister, adding a pressure sensor to the fuel tank, and using the intake manifold to draw the vacuum of the fuel evaporation system when the engine is idling. After that, the negative pressure changes are monitored to determine whether there is a leak. However, this method cannot work in the pure electric mode of hybrid vehicles and has limitations.

[0060] Based on the above problems, the embodiment of the present application proposes a fuel evaporation leakage diagnosis method, which adopts a fuel evaporation leakage diagnosis system, such as Figure 2As shown, the fuel evaporation leakage diagnostic system includes: a first check valve 17 arranged between the engine intake manifold 19 and the first end of the activated carbon canister 15, a second check valve 21 arranged between the carbon canister ash filter 22 and the second end of the activated carbon canister 15, a pressure sensor 13 arranged between the fuel tank 3 and the third end of the activated carbon canister 15, an oil-gas separator 8 arranged between the refueling pipe circulation pipe 7 and the second ventilation pipe 9, an ICV valve 4 arranged on the fuel tank 3 and connected to one end of the refueling pipe main pipe 2, a GVV valve 5 arranged on the fuel tank 3 and connected to one end of the first ventilation pipe 6, an FLVV valve 10 arranged in the fuel tank 3, a fuel pump with an oil level sensor assembly 11 and a high-pressure fuel rail 24, wherein the first check valve 17 is as close to the engine intake manifold 19 as possible, The second check valve 21 is as close as possible to the end of the air pipe 20 to ensure that the entire fuel evaporation system is detected as completely as possible. The pressure sensor 13 is located on the fuel tank 3 and can detect the pressure change of the entire fuel evaporation system. The ICV valve 4 is used to add fuel into the fuel tank 3 and prevent the fuel from flowing out of the fuel tank 3 through the filling pipe main 2. The GVV valve 5 is used to control the pressure balance inside the fuel tank 3 to prevent fuel leakage. The FLVV valve 10 can automatically close when the fuel level reaches a preset upper limit to prevent the fuel from continuing to flow into the fuel tank 3. One end of the fuel pump with the oil level sensor assembly 11 is connected to the high-pressure fuel rail 24 through the fuel delivery pipeline 23, and is used to extract fuel from the fuel tank 3 and deliver the fuel to the high-pressure fuel rail 24 through the fuel delivery pipeline 23. Therefore, by using the two-way check valve and the pressure sensor, the fuel evaporation leakage can be diagnosed at any time, which solves the problem that the existing technology is high in cost and is limited by the vehicle working conditions and the external environment, and enhances applicability.

[0061] For example, Figure 1 As shown, the fuel evaporation leakage diagnosis method includes the following steps:

[0062] In step S101, the current operating condition of the vehicle is obtained.

[0063] It is understandable that the current operating condition of the vehicle can be obtained by real-time monitoring of sensor data (such as vehicle speed, engine speed, etc.) by the ECU (Electronic Control Unit).

[0064] In step S102, if the current working condition is a preset stable working condition, the first stop valve and the second stop valve are controlled to be in a normally closed state, and the current oil pressure change value of the pressure sensor is obtained.

[0065] Among them, the preset stable operating condition refers to the situation after the vehicle is turned off and parked. At this time, the engine has stopped working and the vehicle is no longer moving, or the stable driving condition of the vehicle in pure electric mode.

[0066] It is understandable that, combined with Figure 2 As shown, for the high-pressure fuel tank system, in order to control the volatile emission of fuel vapor, the first check valve and the second check valve are in a normally closed state. At this time, the vehicle is affected by the external temperature environment and the vehicle's own thermal energy, and the pressure in the tank will always be positive or negative. When the current operating condition of the vehicle is the preset stable operating condition, such as shutting down and parking after driving, there is almost no short-term pressure change. Therefore, the ECU can periodically read the current tank pressure value of the pressure sensor when the vehicle is parked, and monitor the current oil pressure change value of the pressure sensor within a set period (such as 30s).

[0067] In step S103, if the current oil pressure change value is not within the preset oil pressure change range, it is determined that there is a fuel evaporation leakage.

[0068] Specifically, by presetting an oil pressure change range, which is the normal oil pressure fluctuation range based on the no-leakage state, the current oil pressure change value is compared with the preset oil pressure change range. If the current oil pressure change value is not in the preset oil pressure change range, that is, the current oil pressure change value exceeds the preset oil pressure change range, the ECU determines that there is a fuel evaporation leakage.

[0069] Furthermore, in some embodiments, after obtaining the current operating condition of the vehicle, it also includes: if the current operating condition is not a preset stable operating condition, determining whether the engine of the vehicle is in a working state; if the engine is in a working state, controlling the first on-off valve and the second on-off valve to be in an open state, and flushing and desorbing the activated carbon canister.

[0070] That is to say, when the current operating condition of the vehicle is not the preset stable operating condition, the system can further judge the state of the engine, and control the first check valve and the second check valve accordingly. When the engine is in working condition, the first check valve and the second check valve can be controlled to be in an open state to allow the fuel vapor to enter the activated carbon canister for adsorption, and flush and desorb it at an appropriate time to remove the fuel vapor adsorbed in the activated carbon canister to prevent it from being saturated and affecting the overall performance of the system.

[0071] It is understandable that the flushing and desorption operation can usually be achieved by introducing fresh air or external airflow, which can take out the adsorbed fuel vapor through the activated carbon canister and send it to the engine combustion chamber for combustion, wherein the timing and duration of the flushing and desorption can be determined according to the driving conditions of the vehicle, the working state of the engine and the adsorption amount of the activated carbon canister. In addition, after the flushing and desorption operation is completed, the first stop valve and the second stop valve can be re-closed according to actual needs to restore the normal working state of the fuel evaporation control system.

[0072] Optionally, in some embodiments, after obtaining the current operating condition of the vehicle, it also includes: if the current operating condition is not a preset stable operating condition, determining whether the vehicle is in a refueling mode; if the vehicle is in a refueling mode, controlling the second stop valve to be in an open state.

[0073] When the current operating condition of the vehicle is not the preset stable operating condition, in addition to judging the working state of the engine, it is also possible to consider whether the vehicle is in a specific operating mode, such as refueling mode, etc. It is possible to judge whether the vehicle is in refueling mode by reading sensors or signals related to refueling (such as the rate of change of the fuel tank liquid level, the state of the fuel filler cap, the operating state of the refueling pump, etc.). When the vehicle is in refueling mode, only the second stop valve is controlled to be in the open state to allow the fuel vapor to smoothly pass through the activated carbon canister or be directly discharged into the atmosphere during the refueling process, thereby avoiding the formation of excessive pressure in the fuel tank.

[0074] Furthermore, in some embodiments, when determining that there is a fuel evaporation leakage, it also includes: determining the duration of time that the current oil pressure change value is not within a preset oil pressure change range; if the duration is greater than the preset duration, determining that there is a fuel evaporation leakage.

[0075] In an embodiment of the present application, when it is determined that there is a fuel evaporation leakage, if the current oil pressure change value is not within the preset oil pressure change range, then when the oil pressure change value exceeds the preset oil pressure change range for the first time, the system starts timing or marks a starting time point, and continues to monitor the oil pressure change value in the subsequent time and monitors whether it still exceeds the preset oil pressure change range. If the current oil pressure change value continues to be outside the preset oil pressure change range, the duration from the starting time point to the current time is calculated, and the duration is compared with the preset duration. If the duration is greater than the preset duration, it can be determined that there is a fuel evaporation leakage.

[0076] In this way, short-term oil pressure fluctuations that may be caused by other interference factors (such as external temperature changes, vehicle vibrations, etc.) can be avoided, and continuous oil pressure changes that exceed the preset oil pressure change range are more likely to be caused by system leakage, thereby improving the reliability of judgment.

[0077] In addition, in some embodiments, after determining that there is a fuel evaporation leakage, the method further includes: generating a fuel leakage alarm signal; and issuing an alarm reminder based on the fuel leakage alarm signal.

[0078] That is to say, once it is determined that there is a fuel evaporation leakage, the corresponding warning mechanism can be triggered immediately, that is, a fuel leakage alarm signal is generated (such as lighting up a fault indicator light, or playing a fault voice prompt, etc.), so as to issue an alarm reminder based on the fuel leakage alarm signal, thereby adjusting the vehicle's control strategy as needed to ensure the safety and environmental protection of the vehicle.

[0079] According to the fuel evaporation leakage diagnosis method proposed in the embodiment of the present application, the current working condition of the vehicle is obtained, and when the current working condition is a preset stable working condition, the first check valve and the second check valve are controlled to be in a normally closed state, and the current oil pressure change value of the pressure sensor is obtained; and when the current oil pressure change value is not in the preset oil pressure change range, it is determined that there is a fuel evaporation leakage. Therefore, by using a double check valve and a pressure sensor, fuel evaporation leakage can be diagnosed at any time, which solves the problem that the existing technology is high in cost and is limited by vehicle working conditions and external environment, and enhances applicability.

[0080] Next, the fuel evaporation leakage diagnostic device proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0081] Figure 3 It is a block diagram of a fuel evaporation leakage diagnostic device according to an embodiment of the present application.

[0082] like Figure 3 As shown, the fuel evaporation leakage diagnostic device 30 adopts a fuel evaporation leakage diagnostic system, which includes a first check valve arranged between the engine intake manifold and the first end of the activated carbon canister, a second check valve arranged between the carbon canister ash filter and the second end of the activated carbon canister, and a pressure sensor arranged between the fuel tank and the third end of the activated carbon canister, wherein the fuel evaporation leakage diagnostic device 30 includes: an acquisition module 100, a control module 200 and a determination module 300.

[0083] Wherein, the acquisition module 100 is used to acquire the current working condition of the vehicle;

[0084] The control module 200 is used to control the first stop valve and the second stop valve to be in a normally closed state when the current working condition is a preset stable working condition, and obtain the current oil pressure change value of the pressure sensor;

[0085] The determination module 300 is used to determine the presence of fuel evaporation leakage when the current oil pressure change value is not within a preset oil pressure change range.

[0086] According to one embodiment of the present application, after obtaining the current working condition of the vehicle, the obtaining module 100 is further used to:

[0087] When the current operating condition is not a preset stable operating condition, determining whether the engine of the vehicle is in a working state;

[0088] When the engine is in operation, the first on-off valve and the second on-off valve are controlled to be in an open state, and the activated carbon canister is flushed and desorbed.

[0089] According to one embodiment of the present application, after obtaining the current working condition of the vehicle, the obtaining module 100 is further used to:

[0090] When the current operating condition is not a preset stable operating condition, determining whether the vehicle is in a refueling mode;

[0091] When the vehicle is in the refueling mode, the second on-off valve is controlled to be in an open state.

[0092] According to an embodiment of the present application, when it is determined that there is a fuel evaporation leakage, the determination module 300 is further used to:

[0093] Determine the duration of time during which the current oil pressure change value is not within the preset oil pressure change range;

[0094] If the duration is longer than the preset time, it is determined that there is a fuel evaporation leak.

[0095] According to an embodiment of the present application, after determining that there is a fuel evaporation leakage, the determination module 300 is further configured to:

[0096] Generate a fuel leak alarm signal;

[0097] An alarm reminder is given based on the fuel leak alarm signal.

[0098] It should be noted that the above explanations of the embodiment of the fuel evaporation leakage diagnosis method are also applicable to the fuel evaporation leakage diagnosis device of this embodiment, and will not be repeated here.

[0099] According to the fuel evaporation leakage diagnosis device proposed in the embodiment of the present application, the current working condition of the vehicle is obtained, and when the current working condition is a preset stable working condition, the first check valve and the second check valve are controlled to be in a normally closed state, and the current oil pressure change value of the pressure sensor is obtained; and when the current oil pressure change value is not in the preset oil pressure change range, it is determined that there is a fuel evaporation leakage. Therefore, by using a double check valve and a pressure sensor, the fuel evaporation leakage can be diagnosed at any time, which solves the problem that the existing technology is high in cost and is limited by the vehicle working condition and the external environment, and enhances applicability.

[0100] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0101] Memory 401 , processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0102] When the processor 402 executes the program, the fuel evaporation leakage diagnosis method provided in the above embodiment is implemented.

[0103] Furthermore, the vehicle also includes:

[0104] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0105] The memory 401 is used to store computer programs that can be executed on the processor 402 .

[0106] The memory 401 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0107] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0108] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0109] The processor 402 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0110] The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned fuel evaporation leakage diagnosis method is implemented.

[0111] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0113] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for diagnosing fuel evaporation leakage, characterized in that: The method adopts a fuel evaporation leakage diagnostic system, which includes a first on-off valve arranged between an engine intake manifold and a first end of an activated carbon canister, a second on-off valve arranged between a carbon canister ash filter and a second end of the activated carbon canister, and a pressure sensor arranged between a fuel tank and a third end of the activated carbon canister, wherein the method includes the following steps: Get the current working condition of the vehicle; If the current working condition is a preset stable working condition, the first stop valve and the second stop valve are controlled to be in a normally closed state, and a current oil pressure change value of the pressure sensor is obtained; If the current oil pressure change value is not within the preset oil pressure change range, it is determined that there is a fuel evaporation leakage.

2. The method according to claim 1, characterized in that After obtaining the current working condition of the vehicle, the method further includes: If the current operating condition is not the preset stable operating condition, determining whether the engine of the vehicle is in a working state; If the engine is in the working state, the first on-off valve and the second on-off valve are controlled to be in an open state, and the activated carbon canister is flushed and desorbed.

3. The method according to claim 1, characterized in that After obtaining the current working condition of the vehicle, the method further includes: If the current operating condition is not the preset stable operating condition, determining whether the vehicle is in a refueling mode; If the vehicle is in the refueling mode, the second on-off valve is controlled to be in an open state.

4. The method according to claim 1, characterized in that When determining that there is a fuel evaporation leak, the method further includes: Determine the duration of time during which the current oil pressure change value is not within the preset oil pressure change range; If the duration is longer than a preset duration, it is determined that there is a fuel evaporation leak.

5. The method according to claim 1, characterized in that After determining that there is a fuel evaporation leak, it also includes: Generate a fuel leak alarm signal; An alarm is issued based on the fuel leakage alarm signal.

6. A fuel evaporation leakage diagnostic device, characterized in that: The device adopts a fuel evaporation leakage diagnostic system, which includes a first check valve arranged between the engine intake manifold and the first end of the activated carbon canister, a second check valve arranged between the carbon canister ash filter and the second end of the activated carbon canister, and a pressure sensor arranged between the fuel tank and the third end of the activated carbon canister, wherein the device includes: An acquisition module, used to acquire the current working condition of the vehicle; a control module, configured to control the first stop valve and the second stop valve to be in a normally closed state when the current working condition is a preset stable working condition, and to obtain a current oil pressure change value of the pressure sensor; The determination module is used to determine the presence of fuel evaporation leakage when the current oil pressure change value is not within a preset oil pressure change interval.

7. The device according to claim 6, characterized in that After acquiring the current working condition of the vehicle, the acquisition module is further used to: When the current operating condition is not the preset stable operating condition, determining whether the engine of the vehicle is in a working state; When the engine is in the working state, the first on-off valve and the second on-off valve are controlled to be in an open state, and the activated carbon canister is flushed and desorbed.

8. The device according to claim 6, characterized in that After acquiring the current working condition of the vehicle, the acquisition module is further used to: When the current operating condition is not the preset stable operating condition, determining whether the vehicle is in a refueling mode; When the vehicle is in the refueling mode, the second on-off valve is controlled to be in an open state.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the fuel evaporation leakage diagnosis method according to any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the fuel evaporation leakage diagnosis method as described in any one of claims 1 to 5.

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