Fuel evaporative emission leakage diagnosis method and related device

Abstract

The invention provides a fuel evaporative emission leakage diagnosis method and a related device. The diagnosis method comprises the following steps: acquiring pressure information of a fuel tank in a fuel evaporative emission system; determining attenuation information based on the pressure information; and state information of the fuel evaporative emission system is determined based on the attenuation information, wherein the state information at least comprises leakage of the system and non-leakage of the system. According to the fuel evaporative emission leakage diagnosis method and the related device provided by the invention, the leakage diagnosis of the fuel evaporative emission system can be realized by using the original hardware equipment of the whole vehicle, the detection time is shortened, the diagnosis cost is saved, and the technical problems of high fuel evaporative emission leakage detection cost and high difficulty in the prior art are effectively solved.

Description

Technical Field

[0001] The present invention relates to automobile technology, in particular to the field of automobile intelligent control technology, and specifically to a fuel evaporative emission leakage diagnosis method and related devices. Background Art

[0002] As automobile exhaust pollution becomes increasingly serious, the restrictions on the atmospheric emissions allowed by vehicles in the automobile exhaust emission regulations that have been promulgated have become increasingly strict, but this has also promoted the rapid development of automobile hybrid technology. At present, hybrid models including plug-in hybrid PHEV and extended-range hybrid REEV have gradually become the most acceptable models to the general public after several years of technological accumulation.

[0003] Hybrid vehicles not only have good fuel economy, but also can switch between engine and battery working states, which can effectively solve the anxiety caused by the unstable mileage of pure electric vehicles. However, in hybrid vehicles, the switching between the oil circuit and the circuit may cause the oil and gas vapor inside the fuel tank to be frequently transported to the carbon canister, making it saturated or even directly discharged into the atmosphere. In the face of increasingly severe environmental pressures, in order to prevent fuel vapor from polluting the atmosphere, GB18352.6-2016 "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" (hereinafter referred to as the National VI Regulations) has imposed stricter restrictions on evaporative emissions, and introduced requirements for fuel evaporative emission system leakage diagnosis, and at the same time requires the on-board diagnostic system to detect the leakage caused by small holes ≥1mm and ≥0.5mm in the fuel evaporative emission system.

[0004] The fuel vapor emission leakage detection method used in the prior art requires the detection of a standard reference hole, which has a high detection cost. At the same time, the 0.5mm reference hole of the whole vehicle is blocked under complex working conditions, which increases the difficulty of the detection process and parameter matching.

[0005] Therefore, the prior art has the technical problems of high cost and difficulty in detecting fuel evaporative emission leaks. Summary of the invention

[0006] The main purpose of the present invention is to provide a fuel evaporative emission leakage diagnosis method and related devices to solve the technical problems of high cost and difficulty in fuel evaporative emission leakage detection in the prior art.

[0007] In order to achieve the above object, according to one aspect of the present invention, a fuel evaporative emission leakage diagnosis method is provided, comprising the following steps: Collect the pressure information of the fuel tank in the fuel evaporative emission system; Determining attenuation information based on the pressure information, the attenuation information being an integral value of a pressure value in the fuel evaporative emission system within a specified time or a time difference between a preset pressure drop of a pressure value in the fuel evaporative emission system; The state information of the fuel evaporative emission system is determined based on the attenuation information, and the state information at least includes whether there is leakage in the system or not.

[0008] In some embodiments, after acquiring the status information, the method further includes generating warning information based on the status information, wherein the warning information is used to indicate that there is a risk of leakage in the fuel evaporative emission system.

[0009] In some embodiments, determining the state information of the fuel evaporative emission system based on the attenuation information includes: acquiring calibration information of the fuel evaporative emission system; and determining the state information of the fuel evaporative emission system based on the calibration information and the attenuation information.

[0010] In some embodiments, determining the attenuation information based on the pressure information includes: determining an operating mode of the fuel evaporative emission system based on the pressure information, the operating mode including a first operating mode and a second operating mode; and determining the attenuation information based on the operating mode.

[0011] In some embodiments, determining the operating mode of the fuel evaporative emission system based on the pressure information includes: when the fuel tank pressure P is greater than or equal to a first pressure threshold P1, the fuel evaporative emission system is in a first operating mode; when the fuel tank pressure P is less than the first pressure threshold P1, the fuel evaporative emission system is in a second operating mode.

[0012] In some embodiments, determining the attenuation information based on the operating mode includes: when the fuel evaporative emission system is in the first operating mode, closing the solenoid valve in sequence, opening the fuel tank isolation valve, and releasing the fuel tank pressure to the fuel evaporative emission system; recording the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2, and calculating the integral value of the fuel tank pressure P between [T1, T2], where P0>P1>P2.

[0013] In some embodiments, determining the attenuation information based on the operating mode includes: when the fuel evaporative emission system is in the second operating mode, sequentially opening the fuel tank isolation valve, closing the solenoid valve, and pressurizing the fuel evaporative emission system to a pressure of P0; recording the time T1 when the fuel tank pressure P drops to a first preset value P1 and the time T2 when the fuel tank pressure P drops to a second preset value P2, and calculating the integral value of the fuel tank pressure P between [T1, T2], wherein P0>P1>P2.

[0014] In some embodiments, determining the attenuation information based on the pressure information includes: closing the solenoid valve in sequence, opening the fuel tank isolation valve, releasing the fuel tank pressure to the fuel evaporative emission system, and pressurizing the fuel evaporative emission system to increase its pressure to P0; recording the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2, and calculating the integral value of the fuel tank pressure P between [T1, T2], wherein P0>P1>P2.

[0015] According to another aspect of the present invention, the present invention also provides a fuel evaporative emission leakage warning device, including: a collection module, used to collect pressure information of a fuel tank in a fuel evaporative emission system; a first determination module, used to determine attenuation information based on the pressure information; a second determination module, used to determine state information of the fuel evaporative emission system based on the attenuation information, and the state information at least includes whether there is a leakage in the system and whether there is no leakage in the system.

[0016] According to another aspect of the present invention, the present invention further provides a storage medium storing a computer program, wherein when the computer program is executed by a processor, the steps of any of the aforementioned fuel evaporative emission leakage diagnosis methods are implemented.

[0017] According to another aspect of the present invention, the present invention also provides an electronic device, comprising at least a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program on the memory, the steps of the fuel evaporative emission leakage diagnosis method described in any one of the above items are implemented.

[0018] The fuel evaporative emission leakage diagnosis method of the present application collects the pressure information of the fuel tank in the fuel evaporative emission system; and determines the attenuation information based on the pressure information; thereby determining the status information of the fuel evaporative emission system, and the original hardware equipment of the whole vehicle can be used to diagnose the leakage of the fuel evaporative emission system, thereby shortening the detection time, saving the diagnosis cost, and effectively solving the technical problems of high cost and difficulty in fuel evaporative emission leakage detection in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 A flowchart showing the steps of the fuel evaporative emission leakage diagnosis method provided by the present invention is shown; Figure 2 The system structure diagram of the fuel evaporation emission system provided by the present invention is shown; Figure 3 A flowchart of the steps of determining attenuation information based on the pressure information provided by the present invention is shown; Figure 4 A flowchart of the steps of determining the attenuation information based on the operating mode provided by the present invention is shown; Figure 5 A flowchart showing the steps of determining the state information of the fuel evaporative emission system based on the attenuation information provided by the present invention is shown; Figure 6 The structure block diagram of the fuel evaporative emission leakage diagnosis device provided by the present invention is shown; Figure 7 The figure shows a schematic diagram of the structure of the electronic device provided by the present invention.

[0020] The above drawings include the following reference numerals: 10. Fuel tank; 20. Carbon canister; 30. Diagnostic device; 40. Pressure detection device; 50. Fuel tank isolation valve; 60. Carbon canister control valve; 70. Engine air intake system. DETAILED DESCRIPTION

[0021] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0022] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0024] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0025] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0026] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0027] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0029] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0030] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] As automobile exhaust pollution becomes increasingly serious, automobile exhaust emission regulations have become increasingly stringent in restricting vehicles' allowed atmospheric emissions. Therefore, during the use of the vehicle, it is necessary to detect leaks in the evaporative emission system consisting of the fuel tank and the entire evaporative pipeline.

[0032] The fuel vapor emission leakage detection method commonly used in the prior art requires the detection of a standard reference hole, which has a high detection cost. At the same time, the 0.5mm reference hole of the whole vehicle is blocked under complex working conditions, which increases the difficulty of the detection process and parameter matching.

[0033] In order to solve the technical problems of high cost and great difficulty in the prior art of fuel evaporative emission leakage detection, the present invention provides a fuel evaporative emission leakage diagnosis method and related devices.

[0034] Figure 1 The flowchart of the fuel evaporative emission leakage diagnosis method provided by the present invention is shown as follows: Figure 1As shown, the fuel evaporative emission leakage diagnosis method includes the following steps: S101, collecting pressure information of a fuel tank in a fuel evaporative emission system.

[0035] In this step, the pressure information of the fuel tank in the fuel evaporative emission system is collected; wherein the fuel evaporative emission system includes at least the fuel tank and the carbon canister of the vehicle, and the pressure information is used to indicate the pressure in the fuel tank, and can be collected by a pressure sensor disposed in the fuel tank. Preferably, the pressure information can be collected, for example, by a pressure sensor provided in the fuel tank, and obtained by the ECU of the vehicle.

[0036] like Figure 2 As shown, the fuel evaporative emission system comprises at least a fuel tank 10, a carbon canister 20, a diagnostic device 30 and a pressure detection device 40, wherein the carbon canister 20 is respectively connected to the fuel tank 10 and the engine intake system 70 through pipelines, so that the fuel vapor in the fuel tank 10 is adsorbed by the carbon canister 20 to prevent the fuel vapor in the fuel tank 10 from being directly discharged into the atmosphere, a fuel tank isolation valve 50 is provided between the carbon canister 20 and the fuel tank 10, and the fuel tank isolation valve 50 is used to control the pipeline connection between the fuel tank 10 and the carbon canister 20, a carbon canister control valve 60 is provided between the carbon canister 20 and the engine intake system 70, and the carbon canister control valve 60 is used to control the fluid connection between the carbon canister 20 and the engine intake system 70, and the pressure detection device 40 is used to detect the pressure parameters inside the system.

[0037] The diagnostic device 30 includes an air inlet and an air outlet, the air inlet is connected to the atmosphere, and fresh air from the outside can enter the fuel evaporative emission system through the air inlet, and the air outlet is connected to the carbon canister. A pressurizing component, a one-way valve component and a solenoid valve are provided in the diagnostic device, and a first ventilation path and a second ventilation path connecting the air inlet and the air outlet are formed in the diagnostic device, wherein the first ventilation path directly connects the air inlet with the air outlet, so that the carbon canister can be directly connected to the external atmosphere through the air inlet; the second ventilation path connects the air inlet with the pressurizing component, the one-way valve component and the air outlet in sequence, and the solenoid valve component switches the first ventilation path and the second ventilation path in the diagnostic device based on the detection requirements to achieve air path connection between the air inlet and the air outlet.

[0038] Furthermore, the pressure sensor may also be disposed in a pipeline connected to the fuel tank; the present application does not limit the location of the pressure sensor and the method of obtaining the pressure information, as long as the pressure information in the fuel tank can be obtained.

[0039] S102: Determine attenuation information based on the pressure information.

[0040] After completing the above step S101, in this step, the attenuation information is determined based on the pressure information; wherein the attenuation information is an attenuation integral value or an attenuation time difference, the attenuation integral value is the integral value of the pressure value in the fuel evaporative emission system within a specified time, and the attenuation time difference is the time difference for the pressure value in the fuel evaporative emission system to decay from a first preset value P1 to a second preset value P2.

[0041] Specifically, Figure 2 FIG. 4 shows a flowchart of the steps of determining attenuation information based on the pressure information provided by the present invention, such as Figure 2 As shown, determining the attenuation information based on the pressure information includes the following steps: S201, determining an operation mode of the fuel evaporative emission system based on the pressure information, wherein the operation mode includes a first operation mode and a second operation mode.

[0042] In this step, the operation mode of the fuel evaporative emission system is determined based on the pressure information, and the operation mode includes a first operation mode and a second operation mode. When the fuel tank pressure P is greater than or equal to the pressure threshold P0, the fuel evaporative emission system is in the first operation mode; when the fuel tank pressure P is less than the pressure threshold P0, the fuel evaporative emission system is in the second operation mode; all pressure thresholds P0 are determined based on the parameters of the fuel tank and the carbon canister.

[0043] For example, in some embodiments, the pressure threshold P0 may be 5 KPa. When the fuel tank pressure P is greater than or equal to 5 KPa, the fuel evaporative emission system is in the first operating mode. When the fuel tank pressure P is less than 5 KPa, the fuel evaporative emission system is in the second operating mode.

[0044] S202: Determine the attenuation information based on the operating mode.

[0045] After the operation mode of the fuel evaporative emission system is determined, in this step, the attenuation information is determined based on the operation mode.

[0046] Further, Figure 3 The flowchart of the steps of determining the attenuation information based on the operating mode provided by the present invention is shown as follows: Figure 3 As shown, determining the attenuation information based on the operating mode includes the following steps: S301, when the fuel evaporative emission system is in the first operating mode, the solenoid valve is closed in sequence, the fuel tank isolation valve is opened, and the fuel tank pressure is released to the fuel evaporative emission system; the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2 is recorded, and the integral value of the fuel tank pressure P between [T1, T2] is calculated, where P0>P1>P2.

[0047] Specifically, when the fuel evaporative emission system is in the first operating mode, the pressure in the fuel tank is greater than or equal to the pressure threshold value P0; at this time, the solenoid valves are closed in sequence to cut off the air circulation between the fuel evaporative emission system and the external atmospheric environment; the fuel tank isolation valve is opened to connect the air circulation between the fuel tank and the carbon canister, and the pressure in the fuel tank is released to the fuel evaporative emission system.

[0048] At this time, the pressure of the fuel evaporative emission system drops and gradually stabilizes, and the pressure information is monitored and sampled; the time when the pressure P in the system drops to the first preset value P1 is recorded as T1, and the time when it drops to the second preset value P2 is recorded as T2, and the collected pressure values ​​are integrated and calculated. The interval of the pressure integration is [T1, T2], so as to obtain the time difference ∆T when the pressure P drops from the first preset value P1 to the second preset value P2 and the integral value S1 of the pressure between T1 and T2, where, .

[0049] In a specific embodiment of the present application, the first preset value P1 may be, for example, 4 KPa, and the second preset value P2 may be 3 KPa. The system records the time T1 when the pressure is 4 KPa and the time T2 when the pressure is 3 KPa, thereby obtaining the time interval of the pressure integral, and then calculates the integral value S1 within the time interval when the tank pressure drops from 4 KPa to 3 KPa.

[0050] S302, when the fuel evaporative emission system is in the second operating mode, the fuel tank isolation valve is opened in sequence, the solenoid valve is closed, and the fuel evaporative emission system is pressurized to a pressure of P0; the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2 is recorded, and the integral value of the fuel tank pressure P between [T1, T2] is calculated, P0>P1>P2.

[0051] Specifically, when the fuel evaporative emission system is in the second operating mode, the pressure in the fuel tank is less than the pressure threshold value P0; at this time, the solenoid valves are closed in sequence to cut off the air flow between the fuel evaporative emission system and the external atmospheric environment; the fuel tank isolation valve is opened to connect the air flow between the fuel tank and the carbon canister, and the pressure in the fuel tank is released to the fuel evaporative emission system. At this time, the fuel evaporative emission system forms a closed system, and the pressure-increasing device is used to pressurize the fuel evaporative emission system to increase its pressure until the pressure reaches P0.

[0052] After the pressure in the fuel tank reaches P0, stop pressurizing it, wait until the pressure of the fuel evaporative emission system gradually stabilizes and begins to decrease, monitor the pressure information and take samples; record the time when the pressure P in the system drops to the first preset value P1 as T1, and the time when it drops to the second preset value P2 as T2, integrate the collected pressure values, and the interval of pressure integration is [T1, T2], so as to obtain the time difference ∆T when the pressure P drops from the first preset value P1 to the second preset value P2 and the integral value S1 of the pressure between T1 and T2, where, .

[0053] In a specific embodiment of the present application, the first preset value P1 may be, for example, 4 KPa, and the second preset value P2 may be 3 KPa. The system records the time T1 when the pressure is 4 KPa and the time T2 when the pressure is 3 KPa, thereby obtaining the time interval of the pressure integral, and then calculates the integral value S1 within the time interval when the tank pressure drops from 4 KPa to 3 KPa.

[0054] In another embodiment of the present application, determining the attenuation information based on the pressure information includes: closing the solenoid valve in sequence, opening the fuel tank isolation valve, releasing the fuel tank pressure to the fuel evaporative emission system, and pressurizing the fuel evaporative emission system to increase its pressure to P0; recording the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2 is dropped, and calculating the integral value of the fuel tank pressure P between [T1, T2], P0>P1>P2.

[0055] Specifically, the solenoid valve is closed in sequence, and the fuel tank isolation valve is opened. The air flow between the fuel evaporative emission system and the external atmosphere is cut off by closing the solenoid valve, and the air flow between the fuel tank and the carbon canister is connected by opening the fuel tank isolation valve, so that the pressure in the fuel tank is released to the fuel evaporative emission system. At this time, the fuel evaporative emission system forms a closed system, and the pressure-increasing device is used to pressurize the fuel evaporative emission system to increase its pressure until the pressure reaches P0.

[0056] After the pressure in the fuel tank reaches P0, stop pressurizing it, wait until the pressure of the fuel evaporative emission system gradually stabilizes and begins to decrease, monitor the pressure information and take samples; record the time when the pressure P in the system drops to the first preset value P1 as T1, and the time when it drops to the second preset value P2 as T2, integrate the collected pressure values, and the interval of pressure integration is [T1, T2], so as to obtain the time difference ∆T when the pressure P drops from the first preset value P1 to the second preset value P2 and the integral value S1 of the pressure between T1 and T2, where, .

[0057] In a specific embodiment of the present application, the first preset value P1 may be, for example, 4 KPa, and the second preset value P2 may be 3 KPa. The system records the time T1 when the pressure is 4 KPa and the time T2 when the pressure is 3 KPa, thereby obtaining the time interval of the pressure integral, and then calculates the integral value S1 within the time interval when the tank pressure drops from 4 KPa to 3 KPa.

[0058] S103, determining state information of the fuel evaporative emission system based on the attenuation information, wherein the state information at least includes whether the system has leakage or not.

[0059] After completing the above step S102, in this step, the state information of the fuel evaporative emission system is determined based on the attenuation information, and the state information at least includes whether the system has leakage or not.

[0060] Specifically, Figure 4 The flowchart of the steps of determining the state information of the fuel evaporative emission system based on the attenuation information provided by the present invention is shown as follows: Figure 4 As shown, determining the state information of the fuel evaporative emission system based on the attenuation information includes the following steps: S401, obtaining calibration information of a fuel evaporative emission system.

[0061] In this step, calibration information of the fuel evaporative emission system is obtained, wherein the calibration information is obtained by pre-calibration, and the calibration information includes a calibration time difference ∆T0 for the pressure P of the fuel evaporative emission system to decrease from a first preset value P1 to a second preset value P2 and a calibration integral value S0 of the pressure between T1 and T2.

[0062] S402: Determine state information of a fuel evaporative emission system based on the calibration information and the attenuation information.

[0063] After completing the above step S401, in this step, the state information of the fuel evaporative emission system is determined based on the calibration information and the attenuation information.

[0064] Further, the attenuation information is compared with calibration information. When the attenuation information is smaller than the calibration information, the fuel evaporation system is in a leakage state. When the attenuation information is larger than the calibration information, the fuel evaporation system is in a non-leakage state.

[0065] Specifically, after obtaining the calibrated time difference ∆T0 and the calibrated integral value S0, the time difference ∆T detected by the system and the calculated integral value S1 are compared with the calibrated time difference ∆T0 and the calibrated integral value S0 respectively. If the time difference ∆T is smaller than the calibrated time difference, it means that the pressure drop rate of the fuel evaporation system is greater than the calibrated rate, and there is a leak in the fuel evaporation emission system; if the integral value S1 is smaller than the calibrated integral value S0, it also means that the pressure drop rate of the fuel evaporation system is greater than the calibrated rate, and there is a leak in the fuel evaporation emission system.

[0066] Table 1 shows the functional relationship between the leakage aperture, time difference and integral value in the fuel evaporative emission system, where the sampling frequency is 200Hz and the data is averaged in a group of 20. It can be seen from Table 1 that if the 0.5mm aperture is used as the standard value, the calibrated time difference ∆T0 of the system is 5.03 and the calibrated integral value S0 is 190.11. If the time difference detected is less than 5.03 or the integral value is less than 190.11, it means that the leakage aperture of the system is greater than the 0.5mm aperture and there is leakage in the system.

[0067] Table 1: Functional relationship between leakage aperture, time difference and integral value in fuel evaporative emission system In another embodiment of the present application, the method further includes generating warning information based on the status information, where the warning information is used to indicate that there is a risk of leakage in the fuel evaporative emission system.

[0068] Specifically, the warning information can be displayed in the system through the vehicle ECU, or uploaded to the cloud through the vehicle network and pushed to associated smart devices to remind drivers and passengers to perform maintenance or replacement in a timely manner.

[0069] The fuel evaporative emission leakage diagnosis method provided by the present invention collects the pressure information of the fuel tank in the fuel evaporative emission system; and determines the attenuation information based on the pressure information; thereby determining the state information of the fuel evaporative emission system, and the diagnosis of the fuel evaporative emission system leakage can be realized by using the original hardware equipment of the whole vehicle, thereby shortening the detection time, saving the diagnosis cost, and effectively solving the technical problems of high cost and great difficulty in the prior art of fuel evaporative emission leakage detection.

[0070] Example 2 In order to better implement the above method, the second aspect of the present disclosure further provides a fuel evaporative emission leakage diagnostic device, which can be integrated on an electronic device.

[0071] For example, Figure 4 As shown, the diagnostic device 200 may include: a collection module 210, a first determination module 220 and a second determination module 230, which are specifically as follows: (1) a collection module 210, wherein the collection module 210 is used to collect pressure information of a fuel tank in a fuel evaporative emission system; (2) a first determination module 220, the first determination module 220 being configured to determine attenuation information based on the pressure information; (3) A second determination module 230, which is used to determine state information of the fuel evaporative emission system based on the attenuation information, wherein the state information at least includes whether the system has leakage or not.

[0072] Further, the attenuation information is an integral value of the pressure value in the fuel evaporative emission system within a specified time or a time difference between the pressure value in the fuel evaporative emission system and a preset pressure drop.

[0073] Further, the second determination module 230 includes an acquisition unit and a first determination unit, wherein the acquisition unit is used to acquire calibration information of the fuel evaporative emission system, and the first determination unit is used to determine state information of the fuel evaporative emission system based on the calibration information and attenuation information.

[0074] Furthermore, the first determination module 220 includes a second determination unit and a third determination unit, wherein the second determination unit is used to determine an operating mode of the fuel evaporative emission system based on the pressure information, the operating mode including a first operating mode and a second operating mode; and the third determination unit is used to determine the attenuation information based on the operating mode.

[0075] Furthermore, determining the operating mode of the fuel evaporative emission system based on the pressure information includes: when the fuel tank pressure P is greater than or equal to a first pressure threshold P1, the fuel evaporative emission system is in a first operating mode; when the fuel tank pressure P is less than the first pressure threshold P1, the fuel evaporative emission system is in a second operating mode.

[0076] Furthermore, determining the attenuation information based on the operating mode includes: when the fuel evaporative emission system is in the first operating mode, closing the solenoid valve in sequence, opening the fuel tank isolation valve, and releasing the fuel tank pressure to the fuel evaporative emission system; recording the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2 is dropped, and calculating the integral value of the fuel tank pressure P between [T1, T2], wherein P0>P1>P2.

[0077] Furthermore, determining the attenuation information based on the operating mode includes: when the fuel evaporative emission system is in the second operating mode, opening the fuel tank isolation valve in sequence, closing the solenoid valve, and pressurizing the fuel evaporative emission system to a pressure of P0; recording the time T1 when the fuel tank pressure P drops to a first preset value P1 and the time T2 when the fuel tank pressure P drops to a second preset value P2, and calculating the integral value of the fuel tank pressure P between [T1, T2], wherein P0>P1>P2.

[0078] Furthermore, determining the attenuation information based on the pressure information includes: closing the solenoid valve in sequence, opening the fuel tank isolation valve, releasing the fuel tank pressure to the fuel evaporative emission system, and pressurizing the fuel evaporative emission system to increase its pressure to P0; recording the time T1 when the fuel tank pressure P drops to the first preset value P1 and the time T2 when the second preset value P2 is dropped, and calculating the integral value of the fuel tank pressure P between [T1, T2], P0>P1>P2.

[0079] The fuel evaporative emission leakage diagnostic device provided by the present invention collects the pressure information of the fuel tank in the fuel evaporative emission system; and determines the attenuation information based on the pressure information; thereby determining the state information of the fuel evaporative emission system, and the diagnosis of the fuel evaporative emission system leakage can be realized by using the original hardware equipment of the whole vehicle, thereby shortening the detection time, saving the diagnosis cost, and effectively solving the technical problems of high cost and great difficulty in the prior art of fuel evaporative emission leakage detection.

[0080] Example 3 A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0081] To this end, a third embodiment of the present disclosure provides a storage medium, which is a computer-readable medium and stores a computer program. When the computer program is executed by a processor, the method provided by the embodiment of the present disclosure is implemented, including the following steps S11 to S13: S11, collecting pressure information of the fuel tank in the fuel evaporative emission system; S12, determining attenuation information based on the pressure information; S13, determining state information of the fuel evaporative emission system based on the attenuation information, wherein the state information at least includes whether the system has leakage or not.

[0082] Furthermore, when the computer program is executed by a processor, other methods provided by any of the above embodiments of the present disclosure are implemented.

[0083] The fuel evaporative emission leakage diagnosis method provided by the present invention collects the pressure information of the fuel tank in the fuel evaporative emission system; and determines the attenuation information based on the pressure information; thereby determining the state information of the fuel evaporative emission system, and the diagnosis of the fuel evaporative emission system leakage can be realized by using the original hardware equipment of the whole vehicle, thereby shortening the detection time, saving the diagnosis cost, and effectively solving the technical problems of high cost and great difficulty in the prior art of fuel evaporative emission leakage detection.

[0084] Example 4 A fourth embodiment of the present disclosure provides an electronic device, such as Figure 5 As shown, the electronic device at least includes a memory 310 and a processor 320. The memory 310 stores a computer program. The processor 320 implements the method provided by any embodiment of the present disclosure when executing the computer program on the memory 310. Exemplarily, the method executed by the electronic device computer program is as follows: S21, collecting pressure information of the fuel tank in the fuel evaporative emission system; S22, determining attenuation information based on the pressure information; S23, determining state information of the fuel evaporative emission system based on the attenuation information, wherein the state information at least includes whether the system has leakage or not.

[0085] In a specific implementation, the acquisition module 210, the first determination module 220 and the second determination module 230 are all stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions.

[0086] The fuel evaporative emission leakage diagnosis method provided by the present invention collects the pressure information of the fuel tank in the fuel evaporative emission system; and determines the attenuation information based on the pressure information; thereby determining the state information of the fuel evaporative emission system, and the diagnosis of the fuel evaporative emission system leakage can be realized by using the original hardware equipment of the whole vehicle, thereby shortening the detection time, saving the diagnosis cost, and effectively solving the technical problems of high cost and great difficulty in the prior art of fuel evaporative emission leakage detection.

[0087] The storage medium may be included in the electronic device, or may exist independently without being installed in the electronic device.

[0088] The storage medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: obtains at least two Internet Protocol addresses; sends a node evaluation request including at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0089] Alternatively, the storage medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device: receives a node evaluation request including at least two Internet Protocol addresses; selects an Internet Protocol address from the at least two Internet Protocol addresses; and returns the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0090] Computer program code for performing operations of the present disclosure may be written in one or more programming languages, or a combination thereof, including, but not limited to, object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages. The program code may be executed entirely on the passenger computer, partially on the passenger computer, as a separate software package, partially on the passenger computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the passenger computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0091] It should be noted that the storage medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any storage medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0092] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0093] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, constitute a limitation on the unit itself.

[0094] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0095] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution. In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode. Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims. Multiple embodiments of the present disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection required by the present disclosure.

Claims

1. A method for diagnosing fuel evaporative emission leakage, characterized in that: The steps include: Collect the pressure information of the fuel tank in the fuel evaporative emission system; Determining attenuation information based on the pressure information, the attenuation information being an integral value of a pressure value in the fuel evaporative emission system within a specified time or a time difference between a preset pressure drop of a pressure value in the fuel evaporative emission system; The state information of the fuel evaporative emission system is determined based on the attenuation information, and the state information at least includes whether there is leakage in the system or not.

2. The fuel evaporative emission leakage diagnosis method according to claim 1, characterized in that: After acquiring the status information, the method further includes: Warning information is generated based on the state information, where the warning information is used to indicate that there is a risk of leakage in the fuel evaporative emission system.

3. The fuel evaporative emission leakage diagnosis method according to claim 1, characterized in that: Determining the state information of the fuel evaporative emission system based on the attenuation information includes: Obtain calibration information for fuel evaporative emissions systems; State information of the evaporative fuel emission system is determined based on the calibration information and the attenuation information.

4. The fuel evaporative emission leakage diagnosis method according to claim 1, characterized in that: The determining of attenuation information based on the pressure information comprises: determining an operation mode of the fuel evaporative emission system based on the pressure information, the operation mode comprising a first operation mode and a second operation mode; The attenuation information is determined based on the operating mode.

5. The fuel evaporative emission leakage diagnosis method according to claim 4, characterized in that: Determining the operating mode of the fuel evaporative emission system based on the pressure information includes: When the fuel tank pressure P is greater than or equal to a first pressure threshold value P1, the fuel evaporative emission system is in a first operating mode; When the fuel tank pressure P is less than a first pressure threshold value P1, the fuel evaporative emission system is in a second operation mode.

6. The fuel evaporative emission leakage diagnosis method according to claim 5, characterized in that: Determining the attenuation information based on the operating mode includes: When the fuel evaporative emission system is in the first operating mode, the solenoid valve is closed in sequence, the fuel tank isolation valve is opened, and the fuel tank pressure is released to the fuel evaporative emission system; The time T1 when the oil tank pressure P drops to the first preset value P1 and the time T2 when the oil tank pressure P drops to the second preset value P2 are recorded, and the integral value of the oil tank pressure P between [T1, T2] is calculated, wherein P0>P1>P2.

7. The fuel evaporative emission leakage diagnosis method according to claim 5, characterized in that: Determining the attenuation information based on the operating mode includes: When the fuel evaporative emission system is in the second operation mode, the fuel tank isolation valve is opened in sequence, the solenoid valve is closed, and the fuel evaporative emission system is pressurized to a pressure of P0; The time T1 when the oil tank pressure P drops to the first preset value P1 and the time T2 when the oil tank pressure P drops to the second preset value P2 are recorded, and the integral value of the oil tank pressure P between [T1, T2] is calculated, wherein P0>P1>P2.

8. The fuel evaporative emission leakage diagnosis method according to claim 1, characterized in that: The determining of attenuation information based on the pressure information comprises: Close the solenoid valves in sequence, open the fuel tank isolation valve, release the fuel tank pressure to the fuel evaporative emission system, and pressurize the fuel evaporative emission system to P0; The time T1 when the oil tank pressure P drops to the first preset value P1 and the time T2 when the oil tank pressure P drops to the second preset value P2 are recorded, and the integral value of the oil tank pressure P between [T1, T2] is calculated, P0>P1>P2.

9. A fuel evaporative emission leakage warning device, characterized in that: include: A collection module, used to collect the pressure information of the fuel tank in the fuel evaporative emission system; A first determining module, configured to determine attenuation information based on the pressure information; The second determination module is used to determine the state information of the fuel evaporative emission system based on the attenuation information, and the state information at least includes whether there is leakage in the system or not.

10. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the fuel evaporative emission leakage diagnosis method according to any one of claims 1 to 8 are implemented.

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