Remote monitoring and optimizing method for fuel evaporation leakage of gasoline vehicle

Abstract

The invention relates to a fuel evaporation leakage monitoring method. The invention relates to a remote monitoring and optimizing method for fuel evaporation leakage of a gasoline vehicle, which comprises the following steps of: transmitting a fuel tank vacuum pressure attenuation gradient value calculated by an ECU (Electronic Control Unit) to a cloud server by using a remote acquisition system,and counting the vacuum pressure attenuation gradient values of the vehicle at different fuel liquid levels by using a model built on the cloud server; generating a corresponding vacuum pressure attenuation gradient statistical graph; carrying out normalization dimensionless parameter processing, generating a normalization dimensionless parameter statistical graph, wherein the normalized parameter value is the ratio of the vacuum pressure attenuation gradient value to the fault threshold value; and if the normalization parameter is larger than or equal to 1, reporting the corresponding leakage fault. Certain abnormal points with poor robustness are found out according to leakage diagnosis faults on a cloud server, the root cause of abnormality is found out in time by calling and analyzingrunning parameters of the automobile at the moment when the abnormal points occur, and online optimization is conducted on fuel leakage diagnosis development data through the cloud.

Description

technical field [0001] The invention relates to a method for monitoring fuel evaporation leakage, in particular to a remote monitoring method for fuel evaporation leakage of National VI gasoline vehicles. Background technique [0002] In recent years, the country has paid more and more attention to environmental protection, advocated the "blue sky defense war", and put forward higher and higher requirements for the emission of light-duty gasoline engines. At present, the National VI standard for light-duty gasoline engines has also been issued. It is getting higher and higher. The National VI standard has added a number of monitoring requirements on the basis of the National V standard. One of them is evaporative emission monitoring. The purpose is to prevent the gasoline in the fuel evaporation system from leaking into the atmosphere and pollute the environment. The current National VI regulations require When the failure of the fuel evaporation system exceeds 1mm (some cou...

AI Technical Summary

Problems solved by technology

However, some difficulties may be encountered in the development process of fuel evaporation leakage diagnosis monitoring calibration, such as different vehicle dispersion, fuel tank vacuum pressure decay gradient performance may be different, and due to the test vehicle and human resource costs and development cycle issues , it is impossible to fully take into account the differences of each working point and each vehicle. Sometimes after-sales often finds that 1mm leakage faults are reported, causing customers to complain. The reason may be either a hardware problem in the fuel evaporation system or fuel leakage diagnosis. The robustness of the development data is not good, and the 1mm leakage fault is falsely reported

[0004] At present, the development of fuel leak diagnosis and calibration is basically carried out offline. The calibration is manually connected to the ECU on the real vehicle to collect a large number of data files, such as dat files, and then open the measurement data one by one, export the data and analyze the data. Finally, use tools such as excel to compare and analyze the results. After finding the problem, manually modify the data on the real vehicle and collect the data to analyze the robustness results. Not only will it take a lot of development time, but also due to the relatively limited data collected, some Inadequate consideration of working conditions increases the probability of after-sales problems and maintenance costs

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