Leak detection methods, devices, terminal equipment, and computer media for evaporation systems

Abstract

This application discloses a method, apparatus, terminal equipment, and computer medium for detecting leaks in an evaporation system, relating to the field of vehicle technology. The method for detecting leaks in an evaporation system includes: acquiring a real-time oxygen closed-loop correction coefficient corresponding to the engine, and acquiring a preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system; comparing the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain a correction coefficient difference; determining whether there is a risk of pipeline leakage in the evaporation system based on the correction coefficient difference; if a risk of pipeline leakage in the evaporation system is determined, generating a leak alarm message and sending the leak alarm message to the user terminal corresponding to the vehicle. Using this application enables the vehicle fault diagnosis system to detect whether there is a risk of pipeline leakage in the evaporation adsorption control system without adding additional hardware.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method, apparatus, terminal equipment, and computer-readable storage medium for detecting leaks in an evaporation system. Background Technology

[0002] With the continuous development of the automotive industry, the emission requirements for fuel vapor are becoming increasingly stringent. Therefore, fuel vehicles are gradually adopting evaporative adsorption control systems to control the carbon canister that adsorbs fuel vapor to perform fuel desorption operations, thus reintroducing the fuel adsorbed by the carbon canister into the engine for combustion and preventing fuel vapor from being directly emitted into the outside. In order to make the carbon canister perform fuel desorption operations more effectively, the evaporative adsorption control system needs to be monitored to prevent the carbon canister from performing fuel desorption operations when there are leaks in the evaporative adsorption control system.

[0003] Currently, technicians primarily use the vehicle's diagnostic system to close the ventilation valve within the evaporative adsorption (EAD) control system, thus sealing the system. This utilizes the negative pressure created by the engine to maintain the EAD control system under negative pressure. They then detect pressure changes within the EAD control system to determine if there are any leaks in the piping. However, this method requires technicians to install a ventilation valve at the atmospheric connection point of the carbon canister, incurring additional hardware costs and resulting in lower accuracy. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, terminal equipment, and computer-readable storage medium for detecting leaks in an evaporation system, which aims to detect the risk of pipeline leaks in the evaporation adsorption control system without adding additional hardware, thereby improving the accuracy of pipeline leak detection.

[0005] To achieve the above objectives, this application provides a leak detection method for an evaporation system, the leak detection method for the evaporation system comprising the following steps:

[0006] Obtain the real-time oxygen closed-loop correction coefficient corresponding to the engine, and obtain the preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system;

[0007] The real-time oxygen closed-loop correction coefficient is compared with the standard correction coefficient to obtain the correction coefficient difference. Based on the correction coefficient difference, it is determined whether the evaporation system has the risk of pipeline leakage.

[0008] If a risk of pipeline leakage is detected in the evaporation system, a leakage alarm is generated and sent to the user terminal corresponding to the vehicle.

[0009] Furthermore, the step of determining whether the evaporation system has the risk of pipeline leakage based on the difference in the correction coefficient includes:

[0010] Obtain a preset standard coefficient difference, and compare the corrected coefficient difference with the standard coefficient difference to obtain a first comparison result;

[0011] If the first comparison result is that the difference in the correction coefficient is greater than or equal to the difference in the standard coefficient, then it is determined that the evaporation system has the risk of pipeline leakage.

[0012] If the first comparison result shows that the difference in the correction coefficient is less than the difference in the standard coefficient, then it is determined that the evaporation system does not have the risk of pipeline leakage.

[0013] Furthermore, the step of determining whether the evaporation system has the risk of pipeline leakage based on the difference in the correction coefficient further includes:

[0014] Determine whether the difference in the correction coefficient is 0;

[0015] If the difference in the correction coefficient is determined to be non-zero, then the evaporation system is determined to have the risk of pipeline leakage.

[0016] If the difference in the correction coefficient is determined to be 0, then it is determined that the evaporation system does not have the risk of pipeline leakage.

[0017] Furthermore, the step of generating the leakage alarm information includes:

[0018] The flow rate of the evaporation system is detected and the corresponding flow rate detection result is obtained. Based on the flow rate detection result, the location of the pipeline leak in the evaporation system is determined.

[0019] Obtain preset initial alarm information, and generate leak alarm information based on the pipeline leak location and the initial alarm information.

[0020] Furthermore, prior to the step of obtaining the real-time oxygen closed-loop correction coefficient corresponding to the engine, the method further includes:

[0021] When the engine's running time reaches a preset time threshold, the fuel reserve corresponding to the carbon canister contained in the evaporation system is detected, and the fuel reserve is compared with a preset reserve diagnostic limit to obtain a second comparison result.

[0022] If the second comparison result indicates that the fuel reserves have reached the reserve diagnostic limit, then it is determined that the carbon canister does not have a risk of surface leakage.

[0023] If the second comparison result indicates that the fuel reserves have not reached the reserve diagnostic limit, then it is determined that the carbon canister has the risk of surface leakage.

[0024] Furthermore, prior to the step of detecting the fuel reserves corresponding to the carbon canister contained within the evaporation system, the method further includes:

[0025] The engine coolant temperature and operating conditions of the engine are detected, and a preset temperature diagnostic limit is obtained.

[0026] If the engine coolant temperature reaches the temperature diagnostic limit and the operating condition is a stable operating condition, then the step of detecting the fuel reserve corresponding to the carbon canister is executed.

[0027] Furthermore, after the step of determining that there is a risk of pipeline leakage in the evaporation system, the method further includes:

[0028] The injection valve of the engine is adjusted to increase the real-time oxygen closed-loop correction coefficient corresponding to the engine, thereby increasing the fuel injection quantity of the engine.

[0029] Furthermore, to achieve the above objectives, this application also provides a leak detection device for an evaporation system, the device comprising:

[0030] The data detection module is used to obtain the real-time oxygen closed-loop correction coefficient corresponding to the engine and to obtain the preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system.

[0031] The leakage detection module is used to compare the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the correction coefficient difference, and to determine whether there is a risk of pipeline leakage in the evaporation system based on the correction coefficient difference;

[0032] The alarm output module is used to generate a leak alarm message and send the leak alarm message to the user terminal corresponding to the vehicle if it is determined that there is a risk of pipeline leakage in the evaporation system.

[0033] In addition, to achieve the above objectives, this application also provides a terminal device, the terminal device comprising: a memory, a processor, and a leak detection program for an evaporation system stored in the memory and executable on the processor, wherein when the leak detection program for an evaporation system is executed by the processor, it implements the steps of the leak detection method for an evaporation system as described above.

[0034] In addition, to achieve the above objectives, this application also provides a computer-readable storage medium storing a leak detection program for an evaporation system, wherein the leak detection program for the evaporation system, when executed by a processor, implements the steps of the leak detection method for the evaporation system as described above.

[0035] The leakage detection method, apparatus, terminal device, and computer-readable storage medium for an evaporation system provided in this application embodiment obtain a real-time oxygen closed-loop correction coefficient for the engine and a preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient for the engine when there is no risk of pipeline leakage in the evaporation system; the real-time oxygen closed-loop correction coefficient is compared with the standard correction coefficient to obtain a correction coefficient difference; based on the correction coefficient difference, it is determined whether there is a risk of pipeline leakage in the evaporation system; if it is determined that there is a risk of pipeline leakage in the evaporation system, a leakage alarm message is generated and the leakage alarm message is sent to the user terminal corresponding to the vehicle.

[0036] In this embodiment, the vehicle fault diagnosis system calls the oxygen sensor to detect the engine, thereby obtaining the real-time oxygen closed-loop correction coefficient corresponding to the engine during the desorption operation. Simultaneously, the vehicle fault diagnosis system reads the electronic control unit configured in the terminal device to obtain the standard correction coefficient corresponding to the engine when the carbon canister performs a desorption operation in an evaporation system without pipeline leakage risk, which is pre-stored by the technician. Then, the vehicle fault diagnosis system compares the obtained real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the difference between the two correction coefficients. The vehicle fault diagnosis system then determines whether there is a pipeline leakage risk in the evaporation system based on the difference in correction coefficients. Finally, if the vehicle fault diagnosis system determines that there is a pipeline leakage risk in the evaporation system, it generates corresponding leakage alarm information and outputs the leakage alarm information to the user terminal corresponding to the vehicle, so as to remind the user of the pipeline leakage risk in the evaporation system through the user terminal.

[0037] Thus, this application achieves the technical effect of enabling vehicle fault diagnosis systems to detect whether there is a risk of pipeline leakage in the evaporation adsorption control system without adding additional hardware by detecting the real-time oxygen closed-loop correction coefficient of the engine when the carbon canister performs desorption operation, and judging whether there is a risk of pipeline leakage in the evaporation system based on the difference between the real-time oxygen closed-loop correction coefficient and the preset standard correction coefficient. This improves the accuracy of pipeline leakage risk detection. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the terminal device in the hardware operating environment involved in the embodiments of this application;

[0039] Figure 2 This is a flowchart illustrating the first embodiment of the leakage detection method for the evaporation system of this application;

[0040] Figure 3 This is a flowchart illustrating the second embodiment of the leakage detection method for the evaporation system of this application;

[0041] Figure 4 This is a flowchart illustrating the third embodiment of the leakage detection method for the evaporation system of this application;

[0042] Figure 5 This is a flowchart illustrating a preferred embodiment of the leakage detection method for the evaporation system of this application;

[0043] Figure 6 This is a schematic diagram of the functional modules involved in an embodiment of the leakage detection method for the evaporation system of this application.

[0044] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0046] Reference Figure 1 , Figure 1 This is a schematic diagram of the terminal device structure of the hardware operating environment involved in the embodiments of this application.

[0047] It should be noted that the terminal device in this application embodiment can be a device that performs the leakage detection method of the evaporation system of this application. Specifically, the terminal device can be a vehicle or a terminal device connected to a vehicle fault diagnosis system, a mobile terminal, a data storage control terminal, a PC, or other terminals.

[0048] like Figure 1As shown, the terminal device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0049] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the terminal device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0050] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and a leak detection program for the evaporation system.

[0051] exist Figure 1 In the terminal device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the terminal device of this application can be set in the terminal device. The terminal device calls the leakage detection program of the evaporation system stored in the memory 1005 through the processor 1001 and executes various embodiments of the leakage detection method of the evaporation system provided in the embodiments of this application.

[0052] Based on the aforementioned terminal equipment, the overall concept of the leakage detection method for the evaporation system of this application is provided.

[0053] As current standards impose increasingly stringent requirements on fuel vapor emissions, fuel vehicles are increasingly adopting evaporative adsorption control systems to control the carbon canisters that adsorb fuel vapors to perform fuel desorption operations, thereby reintroducing the fuel adsorbed by the carbon canisters into the engine for combustion and preventing fuel vapors from being directly emitted into the environment.

[0054] To ensure the carbon canister performs fuel desorption more effectively, the evaporative adsorption (EAD) control system needs to be inspected to prevent it from performing the operation if there are leaks in the EAD control system's piping. Currently, technicians primarily use the vehicle's diagnostic system to close a vent valve within the EAD control system, thus sealing it off. This utilizes the negative pressure generated by the engine to maintain the EAD control system under negative pressure. By monitoring pressure changes in the EAD control system, they can determine if there are any leaks. However, this method requires installing a vent valve at the carbon canister's atmospheric connection, incurring additional hardware costs and resulting in lower accuracy.

[0055] To address the aforementioned issues, this application proposes a leakage detection method for an evaporation system. The method includes the following steps: obtaining a real-time oxygen closed-loop correction coefficient for the engine, and obtaining a preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient for the engine when there is no risk of pipeline leakage in the evaporation system; comparing the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain a correction coefficient difference; determining whether the evaporation system has a pipeline leakage risk based on the correction coefficient difference; if a pipeline leakage risk is detected in the evaporation system, generating a leakage alarm message and sending the leakage alarm message to the user terminal corresponding to the vehicle.

[0056] Thus, this application achieves the technical effect of enabling vehicle fault diagnosis systems to detect whether there is a risk of pipeline leakage in the evaporation adsorption control system without adding additional hardware by detecting the real-time oxygen closed-loop correction coefficient of the engine when the carbon canister is performing desorption operation, and judging whether there is a risk of pipeline leakage in the evaporation system based on the difference between the real-time oxygen closed-loop correction coefficient and the preset standard correction coefficient. This improves the accuracy of pipeline leakage risk detection.

[0057] Based on the overall concept of the terminal equipment and the leakage detection method of the evaporation system of this application, various embodiments of the leakage detection method of the evaporation system of this application are further proposed.

[0058] Please refer to Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the leakage detection method for the evaporation system of this application.

[0059] It should be understood that although the logical order is shown in the flowchart, in some cases, the leak detection method for the evaporation system of this application may of course be performed in a different order than that shown or described here.

[0060] Furthermore, in this embodiment, the leakage detection method of the evaporation system of this application is applied to a terminal device connected to the vehicle fault diagnosis system and electronic control unit configured in the vehicle.

[0061] like Figure 2 As shown, in this embodiment, the leakage detection method for the evaporation system of this application is applied to a vehicle equipped with an evaporation system and may include the following steps:

[0062] Step S10: Obtain the real-time oxygen closed-loop correction coefficient corresponding to the engine, and obtain the preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system;

[0063] The real-time oxygen closed-loop correction factor is the factor used by the oxygen sensor to measure the oxygen content of the exhaust gas during engine closed-loop control. The vehicle control system then adjusts the fuel injection pulse width based on this measurement, thereby regulating the fuel injection quantity to ensure the actual oxygen concentration reaches the target value. In addition, the standard correction factor is the oxygen closed-loop correction factor for the engine when the carbon canister is in an evaporative adsorption control system without the risk of pipeline leakage, performing carbon canister desorption. This standard correction factor is obtained by engineers conducting experiments on the engine in a laboratory and is stored in the electronic control unit (ECU) of the terminal device before the vehicle leaves the factory, allowing the terminal device to retrieve the standard correction factor when needed.

[0064] In this embodiment, when the carbon canister is desorbed, the vehicle fault diagnosis system calls the oxygen sensor to detect the engine and obtain the real-time oxygen closed-loop correction coefficient corresponding to the carbon canister desorption operation. At the same time, the vehicle fault diagnosis system reads the electronic control unit in the terminal device to obtain the standard correction coefficient pre-stored by the technician.

[0065] For example, after the vehicle's fuel engine has been running smoothly for a period of time, the terminal device starts to control the carbon canister to perform a desorption operation according to a preset desorption flow rate. At this time, the terminal device calls the OBD (On Board Diagnostics) system to detect the engine through the internally configured oxygen sensor, thereby determining the real-time oxygen closed-loop correction coefficient Fr corresponding to the engine when the carbon canister performs the desorption operation. At the same time, the OBD system reads the ECU (Electronic Control Unit) configured in the terminal device, thereby obtaining the standard closed-loop correction coefficient Frs that the technician has pre-stored in the ECU.

[0066] Step S20: Compare the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the correction coefficient difference, and determine whether the evaporation system has the risk of pipeline leakage based on the correction coefficient difference;

[0067] In this embodiment, the vehicle fault diagnosis system compares the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the correction coefficient difference between the real-time oxygen closed-loop correction coefficient and the standard correction coefficient. The vehicle fault diagnosis system then determines whether there is a risk of pipeline leakage in the evaporation system based on the correction coefficient difference.

[0068] For example, the OBD system compares the difference between the acquired oxygen closed-loop correction Fr and the acquired standard correction coefficient Frs to obtain the correction coefficient difference Fr-Frs between the real-time oxygen closed-loop correction coefficient Fr and the standard correction coefficient Frs. The OBD system then uses this correction coefficient difference Fr-Frs to determine whether there is a risk of pipeline leakage in the evaporation adsorption control system.

[0069] Furthermore, in a feasible embodiment, the step of "determining whether the evaporation system has the risk of pipeline leakage based on the difference in the correction coefficient" in step S20 above may specifically include:

[0070] Step S201: Obtain the preset standard coefficient difference, and compare the corrected coefficient difference with the standard coefficient difference to obtain the first comparison result;

[0071] The standard coefficient difference is the difference between the oxygen closed-loop correction coefficient of the engine when the carbon canister performs desorption under an evaporative adsorption control system with no risk of pipeline leakage, and the oxygen closed-loop correction coefficient of the engine when the carbon canister performs desorption under an evaporative adsorption control system with a risk of pipeline leakage. It can be understood that the oxygen closed-loop correction coefficient of the engine when the carbon canister performs desorption under an evaporative adsorption control system with a risk of pipeline leakage also needs to be obtained by technicians through experiments on the engine in the laboratory.

[0072] In this embodiment, the vehicle fault diagnosis system reads the electronic control unit to obtain the standard coefficient difference value preset by the technician, and compares the obtained correction coefficient difference value with the standard coefficient difference value to obtain the first comparison result.

[0073] Step S202: If the first comparison result is that the difference in the correction coefficient is greater than or equal to the difference in the standard coefficient, then it is determined that the evaporation system has the risk of pipeline leakage;

[0074] In this embodiment, if the vehicle fault diagnosis system determines that the first comparison result is that the difference in the correction coefficient is greater than or equal to the difference in the standard coefficient, then it determines that there is a risk of pipeline leakage in the evaporation system.

[0075] Step S203: If the first comparison result is that the difference in the correction coefficient is less than the difference in the standard coefficient, then it is determined that the evaporation system does not have the risk of pipeline leakage;

[0076] In this embodiment, if the vehicle fault diagnosis system determines that the difference in the correction coefficient is less than the difference in the standard coefficient in the first comparison result, it determines that there is no risk of pipeline leakage in the evaporation system.

[0077] For example, technicians first need to conduct experiments on the engine in a laboratory to obtain the standard coefficient difference Fthr between the oxygen closed-loop correction coefficient of the engine when the carbon canister performs desorption under an evaporative adsorption control system without the risk of pipeline leakage, and the standard coefficient difference Fthr between the carbon canister performing desorption under an evaporative adsorption control system with the risk of pipeline leakage. This standard coefficient difference Fthr is stored in the ECU of the vehicle. Then, when the OBD system detects the evaporative adsorption control system, it reads the ECU to obtain the standard coefficient difference Fthr preset by the technician. The OBD system compares the obtained correction coefficient difference Fr-Frs with the standard coefficient difference Fthr to obtain a first comparison result. Then, if the OBD system determines that the first comparison result is that the correction coefficient difference Fr-Frs is greater than or equal to the standard coefficient difference Fthr, it determines that there is a pipeline leakage risk in the evaporative adsorption control system. If the OBD system determines that the first comparison result is that the correction coefficient difference Fr-Frs is less than the standard coefficient difference Fthr, it determines that there is no pipeline leakage risk in the evaporative adsorption control system.

[0078] Furthermore, in a feasible embodiment, the step of "determining whether the evaporation system has the risk of pipeline leakage based on the difference in the correction coefficient" in step S20 above may further include:

[0079] Step S204: Determine whether the difference in the correction coefficient is 0;

[0080] Step S205: If it is determined that the difference in the correction coefficient is not 0, then it is determined that the evaporation system has the risk of pipeline leakage;

[0081] Step S206: If the difference in the correction coefficient is determined to be 0, then it is determined that there is no risk of pipeline leakage in the evaporation system;

[0082] For example, after obtaining the correction coefficient difference Fr-Frs, the OBD system can also determine whether the correction coefficient difference Fr-Frs is 0. If the OBD system determines that the correction coefficient difference Fr-Frs is not 0, it determines that there is a risk of pipeline leakage in the evaporation adsorption control system. Similarly, if the OBD system determines that the correction coefficient difference Fr-Frs is 0, it determines that there is no risk of pipeline leakage in the evaporation adsorption system.

[0083] Step S30: If it is determined that there is a risk of pipeline leakage in the evaporation system, a leakage alarm message is generated and the leakage alarm message is sent to the user terminal corresponding to the vehicle;

[0084] In this embodiment, if the vehicle fault diagnosis system determines that there is a risk of pipeline leakage in the evaporation system, it will detect the evaporation system to determine the location of the leak, and generate a leak alarm based on the location of the leak. The vehicle fault diagnosis system will then send the leak alarm to the user terminal used by the user of the vehicle to remind the user that there is a risk of pipeline leakage in the evaporation system.

[0085] For example, if the OBD system determines that there is a risk of pipeline leakage in the evaporative adsorption control system, it determines the location of the leak in the evaporative adsorption control system. The OBD system then generates a leak alarm based on the leak location and converts the leak alarm into a visual interface. After that, the OBD system uploads the visual interface to the terminal device, which then sends the visual interface to the user terminal used by the vehicle driver, thereby reminding the driver of the risk of pipeline leakage in the evaporative adsorption control system through the user terminal.

[0086] Furthermore, in a feasible embodiment, the step of "generating leakage alarm information" in step 30 above may specifically include:

[0087] Step S301: Perform flow detection on the evaporation system and obtain the flow detection result corresponding to the evaporation system; determine the pipeline leak location corresponding to the evaporation system based on the flow detection result.

[0088] In this embodiment, if the vehicle fault diagnosis system determines that there is a risk of pipeline leakage in the evaporation system, it calls the flow detection device to perform flow detection on the evaporation system to obtain the flow detection result. The vehicle fault diagnosis system then compares the flow detection result with the preset standard flow result to determine the location of the pipeline leakage in the evaporation system.

[0089] Step S302: Obtain preset initial alarm information, and generate leak alarm information based on the pipeline leak location and the initial alarm information;

[0090] In this embodiment, the vehicle fault diagnosis system obtains preset initial alarm information and writes the pipeline leak location into the initial alarm information to generate leak alarm information with the pipeline leak location, and then uploads the leak alarm information to the terminal device.

[0091] For example, when the OBD system determines that there is a risk of pipeline leakage in the evaporative adsorption control system, it calls the flow detection device in the detection module to detect the airflow changes in the evaporative adsorption control system and obtain the flow detection result. Then, the OBD system reads the ECU to obtain the standard flow result pre-stored by the technician and compares the flow detection result with the standard flow result to determine the flow difference between the flow detection result and the standard flow result. The OBD system then determines the pipeline leakage location in the evaporative adsorption control system that caused the flow change based on the flow difference. After that, the OBD system obtains the preset initial alarm information and writes the pipeline leakage location into the initial alarm information to generate leakage alarm information with the pipeline leakage location. Finally, the OBD system uploads the generated leakage alarm information to the terminal device.

[0092] In this embodiment, when the carbon canister undergoes desorption, the vehicle fault diagnosis system calls the oxygen sensor to detect the engine and obtain the real-time oxygen closed-loop correction coefficient corresponding to the carbon canister desorption operation. Simultaneously, the system reads the electronic control unit within the terminal device to obtain the standard correction coefficient pre-stored by the technician. Then, the system compares the obtained real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the correction coefficient difference. Based on this difference, the system determines whether there is a risk of pipe leakage in the evaporation system. Finally, if the system detects a risk of pipe leakage in the evaporation system, it detects the system to determine the leak location and generates a leak alarm. The system then sends this alarm to the user terminal used by the vehicle's user to alert the user of the risk of pipe leakage in the evaporation system.

[0093] Thus, this application achieves the technical effect of enabling vehicle fault diagnosis systems to detect whether there is a risk of pipeline leakage in the evaporation adsorption control system without adding additional hardware by detecting the real-time oxygen closed-loop correction coefficient of the engine when the carbon canister is performing desorption operation, and judging whether there is a risk of pipeline leakage in the evaporation system based on the difference between the real-time oxygen closed-loop correction coefficient and the preset standard correction coefficient. This improves the accuracy of pipeline leakage risk detection.

[0094] Furthermore, based on the first embodiment of the leakage detection method for the evaporation system of this application described above, a second embodiment of the leakage detection method for the evaporation system of this application is proposed herein.

[0095] Please refer to Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the leakage detection method for the evaporation system of this application, as shown below. Figure 3 As shown, prior to step S10 above, the leakage detection method for the evaporation system of this application may further include the following steps:

[0096] Step A10: When the engine running time reaches a preset time threshold, detect the fuel storage corresponding to the carbon canister contained in the evaporation system, and compare the fuel storage with a preset storage diagnostic limit to obtain a second comparison result.

[0097] In this embodiment, the vehicle fault diagnosis system detects the engine's running time, and when the running time reaches a preset time threshold, it calculates the fuel storage corresponding to the carbon canister contained in the evaporation system through a preset carbon canister calculation model in the electronic control unit. The vehicle fault diagnosis system then compares the calculated fuel storage with a preset storage diagnostic limit to obtain a second comparison result.

[0098] Step A20: If the second comparison result indicates that the fuel storage capacity has reached the storage capacity diagnostic limit, then it is determined that there is no risk of surface leakage in the carbon canister;

[0099] In this embodiment, if the vehicle fault diagnosis system determines that the second comparison result is that the fuel storage has reached the storage diagnostic limit, it determines that the surface of the carbon canister body is intact, thereby determining that there is no risk of surface leakage in the carbon canister body. The vehicle fault diagnosis system then continues to control the carbon canister to perform desorption operation and further detects the evaporation system to determine whether there is a risk of pipeline leakage in the evaporation system.

[0100] Step A30: If the second comparison result indicates that the fuel storage has not reached the storage diagnostic limit, then it is determined that the carbon canister has the risk of surface leakage;

[0101] In this embodiment, if the vehicle fault diagnosis system determines that the second comparison result is that the fuel storage has not reached the storage diagnosis limit, it determines that the carbon canister body is ruptured, thereby determining that the carbon canister body has a risk of surface leakage.

[0102] For example, the OBD system first detects the engine to determine its running time and compares it with a preset time threshold to determine whether the running time has reached the threshold. If the OBD system determines that the running time has reached the threshold, it further calls the preset carbon canister calculation model in the ECU to calculate the carbon canister contained in the evaporative adsorption control system to determine the fuel storage corresponding to the carbon canister. At the same time, the OBD system reads the preset storage capacity diagnostic limit from the ECU and compares the fuel storage capacity with the storage capacity diagnostic limit to obtain a second comparison result. If the OBD system determines that the second comparison result is that the fuel storage capacity is greater than or equal to the storage capacity diagnostic limit, it determines that the carbon canister surface is intact, thus determining that there is no risk of surface leakage in the carbon canister. If the OBD system determines that the second comparison result is that the fuel storage capacity is less than the storage capacity diagnostic limit, it determines that the carbon canister surface is cracked, thus determining that the carbon canister itself has a risk of surface leakage.

[0103] In this embodiment, the vehicle fault diagnosis system detects the engine's running time. When the running time reaches a preset time threshold, the system calculates the fuel storage corresponding to the carbon canister in the evaporation system using a preset carbon canister calculation model within the electronic control unit. The system then compares the calculated fuel storage with a preset storage capacity diagnostic limit to obtain a second comparison result. If the system determines that the second comparison result indicates that the fuel storage has reached the storage capacity diagnostic limit, it determines that the carbon canister body surface is intact, thus determining that there is no risk of surface leakage in the carbon canister body. The system then continues to control the carbon canister to perform a desorption operation and further detects the evaporation system to determine whether there is a risk of pipeline leakage in the evaporation system. Finally, if the system determines that the second comparison result indicates that the fuel storage has not reached the storage capacity diagnostic limit, it determines that the carbon canister body is cracked, thus determining that there is a risk of surface leakage in the carbon canister body.

[0104] Thus, by detecting the fuel level in the carbon canister and comparing it with a preset diagnostic limit, this application enables the vehicle fault diagnosis system to determine whether there is a risk of surface leakage in the carbon canister without increasing additional hardware costs.

[0105] Furthermore, based on the first and / or second embodiments of the leakage detection method for the evaporation system described above, a third embodiment of the leakage detection method for the evaporation system described above is proposed herein.

[0106] Please refer to Figure 4 , Figure 4 This is a flowchart illustrating the third embodiment of the leakage detection method for the evaporation system of this application, as shown below. Figure 4 As shown, prior to step A10 above, the leakage detection method for the evaporation system of this application may further include the following steps:

[0107] Step B10: Detect the engine coolant temperature and operating conditions corresponding to the engine, and obtain the preset temperature diagnostic limit;

[0108] In this embodiment, before checking the carbon canister, the vehicle fault diagnosis system first calls the temperature sensor to check the engine to determine the engine coolant temperature and the engine operating conditions. At the same time, the vehicle fault diagnosis system reads the electronic control unit to obtain the preset temperature diagnostic limit.

[0109] Step B20: If the engine coolant temperature reaches the temperature diagnostic limit and the operating condition is a stable operating condition, then the step of detecting the fuel storage corresponding to the carbon canister is executed.

[0110] In this embodiment, if the vehicle fault diagnosis system determines that the engine coolant temperature has reached the temperature diagnosis limit and the engine is operating under stable conditions, it calls the carbon canister calculation model in the electronic control unit to calculate the carbon canister and obtain the corresponding fuel storage in the carbon canister. Then, based on the fuel storage, it detects whether there is a risk of surface leakage in the carbon canister.

[0111] For example, before detecting whether there is a risk of surface leakage in the carbon canister, the OBD system first calls the temperature sensor to detect the engine, thereby obtaining the engine coolant temperature corresponding to the engine operation. At the same time, the OBD system determines the engine operating condition and reads the preset temperature diagnostic limit from the ECU. Then, if the OBD system determines that the engine coolant temperature has reached the temperature diagnostic limit and the engine is operating under stable conditions, it calls the carbon canister calculation model in the ECU to calculate the carbon canister to determine the corresponding fuel storage in the carbon canister, and judges whether there is a risk of surface leakage in the carbon canister itself based on the fuel storage.

[0112] In this embodiment, before detecting the carbon canister, the vehicle fault diagnosis system first calls a temperature sensor to detect the engine to determine the engine coolant temperature and the engine's operating conditions. At the same time, the vehicle fault diagnosis system reads the electronic control unit to obtain a preset temperature diagnostic limit. Then, if the vehicle fault diagnosis system determines that the engine coolant temperature has reached the temperature diagnostic limit and the engine is operating under stable conditions, it calls the carbon canister calculation model in the electronic control unit to calculate the carbon canister to obtain the corresponding fuel reserve. Based on the fuel reserve, it then detects whether there is a risk of surface leakage in the carbon canister.

[0113] Thus, by using the method of detecting engine water temperature and operating conditions, this application achieves the goal of enabling the vehicle fault diagnosis system to detect whether there is a risk of leakage in the carbon canister and evaporative adsorption control system under stable engine operating conditions.

[0114] Furthermore, based on the above embodiments of the leakage detection method for the evaporation system of this application, a fourth embodiment of the leakage detection method for the evaporation system of this application is proposed here.

[0115] Following step S40 above, the leakage detection method for the evaporation system of this application may further include the following steps:

[0116] Step C10: Adjust the injection valve of the engine to increase the real-time oxygen closed-loop correction coefficient corresponding to the engine, thereby increasing the fuel injection quantity of the engine;

[0117] In this embodiment, if the vehicle fault diagnosis system determines that there is a risk of pipeline leakage in the evaporation system, it further determines the engine's operating status. Then, if the vehicle fault diagnosis system determines that the engine is in a fuel injection state, it adjusts the engine's injection valve to increase the engine's corresponding real-time oxygen closed-loop correction coefficient, thereby increasing the engine's fuel injection quantity.

[0118] For example, after determining that there is a risk of pipeline leakage in the evaporative adsorption control system, the OBD system further determines the engine's operating state. When the OBD system determines that the engine is in a fuel injection state, it determines that the mixed fuel in the engine pipeline will be mixed with external air, so the concentration of the mixed fuel is not up to standard. The OBD system then adjusts the energizing time of the injection valve in the engine to increase the corresponding real-time oxygen closed-loop correction coefficient Fr, thereby increasing the fuel injection quantity of the engine, so as to maintain the excess air coefficient in the engine at a constant state.

[0119] It should be noted that, in this embodiment, after determining that there is a risk of pipeline leakage in the evaporation system, the vehicle chain fault diagnosis system can also adjust the engine's injection valve when the carbon canister is performing desorption operation, thereby reducing the engine's corresponding real-time oxygen closed-loop correction coefficient and reducing the engine's corresponding fuel injection quantity, so as to maintain the excess air coefficient in the engine at a constant state.

[0120] Furthermore, based on the various embodiments of the leakage detection method for the evaporation system of this application described above, a preferred embodiment of the leakage detection method for the evaporation system of this application is proposed herein.

[0121] Please refer to Figure 5 , Figure 5 This is a flowchart illustrating a preferred embodiment of the leakage detection method for the evaporation system of this application.

[0122] like Figure 5As shown, in this embodiment, when the terminal device is running, it first calls the OBD system to detect the engine, thereby obtaining the engine coolant temperature during engine operation, and then compares this engine coolant temperature with a preset diagnostic temperature limit (i.e., Figure 5 The system compares the engine coolant temperature with the diagnostic temperature in the ECU. After determining that the engine coolant temperature has reached the diagnostic temperature limit, the OBD system further checks the engine's operating condition. Then, when the OBD system determines that the engine is operating under stable conditions and the operating time has reached a preset time threshold, the OBD system calls the carbon canister calculation model in the ECU to calculate the corresponding fuel reserve in the carbon canister (i.e., fuel level). Figure 5 The OBD system then compares the fuel level in the carbon canister with a preset diagnostic limit to determine if there is a risk of surface leakage. If the OBD system determines that the fuel level has reached the diagnostic limit, it determines that there is no risk of surface leakage and controls the carbon canister in the engine to perform desorption according to a preset desorption flow rate. During the desorption process, the OBD system records the real-time oxygen closed-loop correction coefficient Fr. Simultaneously, the OBD system reads the standard correction coefficient Frs preset by the technician from the ECU and compares the real-time oxygen closed-loop correction coefficient Fr with the standard correction coefficient Frs to determine the difference in correction coefficients, Fr-Frs. Then, the OBD system reads the ECU data... The system takes a preset standard coefficient difference value Fthr and compares the correction coefficient difference value Fr-Frs with the standard coefficient difference value Fthr. If the OBD system determines that the correction coefficient difference value Fr-Frs is greater than the standard coefficient difference value Fthr after comparison, it determines that there is a risk of leakage in the evaporative adsorption control system in the vehicle, generates a leakage alarm, and sends the leakage alarm to the user terminal used by the driver corresponding to the vehicle to remind the driver of the risk of leakage in the evaporative adsorption control system. If the OBD system determines that the correction coefficient difference value Fr-Frs is less than the standard coefficient difference value Fthr after comparison, it determines that there is no risk of leakage in the evaporative adsorption control system.

[0123] In addition, to achieve the above objectives, this application also provides a leak detection device for an evaporation system, please refer to... Figure 6 , Figure 6 This is a schematic diagram of the functional modules involved in an embodiment of the leakage detection method for the evaporation system of this application, as shown below. Figure 6 As shown, the device includes:

[0124] Data detection module 10 is used to obtain the real-time oxygen closed-loop correction coefficient corresponding to the engine and to obtain the preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system.

[0125] The leakage detection module 20 is used to compare the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the correction coefficient difference, and to determine whether there is a risk of pipeline leakage in the evaporation system based on the correction coefficient difference.

[0126] The alarm output module 30 is used to generate a leak alarm message and send the leak alarm message to the user terminal corresponding to the vehicle if it is determined that there is a risk of pipeline leakage in the evaporation system.

[0127] Furthermore, the leakage detection module 20 includes:

[0128] The first comparison unit is used to obtain a preset standard coefficient difference and compare the corrected coefficient difference with the standard coefficient difference to obtain a first comparison result;

[0129] The first judgment unit is used to determine that the evaporation system has the risk of pipeline leakage if the first comparison result is that the difference of the correction coefficient is greater than or equal to the difference of the standard coefficient.

[0130] The second judgment unit is used to determine that the evaporation system does not have the risk of pipeline leakage if the first comparison result is that the difference in the correction coefficient is less than the difference in the standard coefficient.

[0131] Furthermore, the leakage detection module 20 also includes:

[0132] The second comparison unit is used to determine whether the difference in the correction coefficient is 0;

[0133] The third judgment unit is used to determine that the evaporation system has the risk of pipeline leakage if the difference of the correction coefficient is not 0.

[0134] The fourth judgment unit is used to determine that the evaporation system does not have the risk of pipeline leakage if the difference in the correction coefficient is determined to be 0.

[0135] Furthermore, the alarm output module 30 includes:

[0136] A location detection unit is used to detect the flow rate of the evaporation system and obtain the flow rate detection result corresponding to the evaporation system, and determine the pipeline leak location corresponding to the evaporation system based on the flow rate detection result;

[0137] The information generation unit is used to acquire preset initial alarm information and generate leakage alarm information based on the pipeline leak location and the initial alarm information.

[0138] Furthermore, the data detection module 10 includes:

[0139] The third comparison unit is used to detect the fuel storage corresponding to the carbon canister contained in the evaporation system when the engine running time reaches a preset time threshold, and compare the fuel storage with a preset storage diagnostic limit to obtain a second comparison result.

[0140] The fifth judgment unit is used to determine that there is no risk of surface leakage in the carbon canister if the second comparison result is that the fuel storage reaches the storage diagnostic limit.

[0141] The sixth judgment unit is used to determine that the carbon canister has the risk of surface leakage if the second comparison result is that the fuel storage does not reach the storage diagnostic limit.

[0142] Furthermore, the data detection module 10 also includes:

[0143] The temperature comparison unit is used to detect the engine coolant temperature and operating conditions of the engine, and to obtain a preset temperature diagnostic limit.

[0144] The operating condition judgment unit is used to execute the step of detecting the fuel storage corresponding to the carbon canister if the engine coolant temperature reaches the temperature diagnostic limit and the operating condition is a stable operating condition.

[0145] Furthermore, the alarm output module 30 also includes:

[0146] An injection adjustment unit is used to adjust the injection valve of the engine to increase the real-time oxygen closed-loop correction coefficient corresponding to the engine, thereby increasing the fuel injection quantity of the engine.

[0147] In addition, this application also provides a terminal device having a leak detection program for an evaporation system that can run on a processor. When the terminal device executes the leak detection program for the evaporation system, it implements the steps of the leak detection method for the evaporation system as described in any of the above embodiments.

[0148] The specific embodiments of the terminal equipment in this application are basically the same as the embodiments of the leakage detection method of the evaporation system described above, and will not be repeated here.

[0149] In addition, this application also provides a computer-readable storage medium storing a leak detection program for an evaporation system, which, when executed by a processor, implements the steps of the leak detection method for an evaporation system as described in any of the above embodiments.

[0150] The specific embodiments of the computer-readable storage medium of this invention are basically the same as the embodiments of the leakage detection method for the evaporation system described above, and will not be repeated here.

[0151] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0152] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0153] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a vehicle or a terminal device connected to a vehicle fault diagnosis system, a mobile terminal, a data storage control terminal, a PC, etc.) to execute the methods described in the various embodiments of this application.

[0154] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A leak detection method for an evaporation system, characterized in that, The leakage detection method for the evaporation system includes the following steps: Obtain the real-time oxygen closed-loop correction coefficient corresponding to the engine, and obtain the preset standard correction coefficient, wherein the standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system, and the real-time oxygen closed-loop correction coefficient is the correction coefficient corresponding to the measurement result obtained by measuring the oxygen content of the gas discharged by the engine during the closed-loop control process, and adjusting the fuel injection quantity according to the measurement result to make the actual value of oxygen concentration reach the target value. The real-time oxygen closed-loop correction coefficient is compared with the standard correction coefficient to obtain the correction coefficient difference. Based on the correction coefficient difference, it is determined whether the evaporation system has the risk of pipeline leakage. If a risk of pipeline leakage is detected in the evaporation system, a leakage alarm is generated and sent to the user terminal corresponding to the vehicle.

2. The leakage detection method for an evaporation system as described in claim 1, characterized in that, The step of determining whether the evaporation system has the risk of pipeline leakage based on the difference of the correction coefficient includes: Obtain a preset standard coefficient difference, and compare the corrected coefficient difference with the standard coefficient difference to obtain a first comparison result; If the first comparison result is that the difference in the correction coefficient is greater than or equal to the difference in the standard coefficient, then it is determined that the evaporation system has the risk of pipeline leakage. If the first comparison result shows that the difference in the correction coefficient is less than the difference in the standard coefficient, then it is determined that the evaporation system does not have the risk of pipeline leakage.

3. The leakage detection method for an evaporation system as described in claim 1, characterized in that, The step of determining whether the evaporation system has the risk of pipeline leakage based on the difference of the correction coefficient further includes: Determine whether the difference in the correction coefficient is 0; If the difference in the correction coefficient is determined to be non-zero, then the evaporation system is determined to have the risk of pipeline leakage. If the difference in the correction coefficient is determined to be 0, then it is determined that the evaporation system does not have the risk of pipeline leakage.

4. The leakage detection method for an evaporation system as described in claim 1, characterized in that, The step of generating the leak alarm information includes: The flow rate of the evaporation system is detected and the corresponding flow rate detection result is obtained. Based on the flow rate detection result, the location of the pipeline leak in the evaporation system is determined. Obtain preset initial alarm information, and generate leak alarm information based on the pipeline leak location and the initial alarm information.

5. The leakage detection method for an evaporation system as described in claim 1, characterized in that, Before the step of obtaining the real-time oxygen closed-loop correction coefficient corresponding to the engine, the method further includes: When the engine's running time reaches a preset time threshold, the fuel reserve corresponding to the carbon canister contained in the evaporation system is detected, and the fuel reserve is compared with a preset reserve diagnostic limit to obtain a second comparison result. If the second comparison result indicates that the fuel reserves have reached the reserve diagnostic limit, then it is determined that the carbon canister does not have a risk of surface leakage. If the second comparison result indicates that the fuel reserves have not reached the reserve diagnostic limit, then it is determined that the carbon canister has the risk of surface leakage.

6. The leakage detection method for an evaporation system as described in claim 5, characterized in that, Prior to the step of detecting the fuel reserves corresponding to the carbon canisters contained within the evaporation system, the method further includes: The engine coolant temperature and operating conditions of the engine are detected, and a preset temperature diagnostic limit is obtained. If the engine coolant temperature reaches the temperature diagnostic limit and the operating condition is a stable operating condition, then the step of detecting the fuel reserve corresponding to the carbon canister is performed.

7. The leakage detection method for an evaporation system as described in claim 1, characterized in that, After the step of determining that there is a risk of pipeline leakage in the evaporation system, the method further includes: The injection valve of the engine is adjusted to increase the real-time oxygen closed-loop correction coefficient corresponding to the engine, thereby increasing the fuel injection quantity of the engine.

8. A leak detection device for an evaporation system, characterized in that, The device includes: The data detection module is used to obtain the real-time oxygen closed-loop correction coefficient corresponding to the engine and to obtain the preset standard correction coefficient. The standard correction coefficient is the oxygen closed-loop correction coefficient corresponding to the engine when there is no risk of pipeline leakage in the evaporation system. The real-time oxygen closed-loop correction coefficient is the correction coefficient corresponding to the measurement result obtained by measuring the oxygen content of the gas discharged by the engine during the closed-loop control process of the engine, and adjusting the fuel injection quantity according to the measurement result to make the actual value of oxygen concentration reach the target value. The leakage detection module is used to compare the real-time oxygen closed-loop correction coefficient with the standard correction coefficient to obtain the correction coefficient difference, and to determine whether there is a risk of pipeline leakage in the evaporation system based on the correction coefficient difference; The alarm output module is used to generate a leak alarm message and send the leak alarm message to the user terminal corresponding to the vehicle if it is determined that there is a risk of pipeline leakage in the evaporation system.

9. A terminal device, characterized in that, The terminal device includes: a memory, a processor, and a leak detection program for the evaporation system stored in the memory and executable on the processor. When the leak detection program for the evaporation system is executed by the processor, it implements the steps of the leak detection method for the evaporation system as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a leak detection program for an evaporation system, which, when executed by a processor, implements the steps of the leak detection method for an evaporation system as described in any one of claims 1 to 7.

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