Device and method for avoiding misdiagnosis of oil tank leakage

Abstract

The device comprises a device for avoiding fuel tank leakage misdiagnosis. The device comprises a vehicle speed sensor used for measuring vehicle driving speed, a detection device used for measuring vehicle braking state data, a fuel tank diagnosis device used for diagnosing a fuel tank system of a vehicle and sending a fuel tank maintenance signal to a vehicle user according to a diagnosis result, and a control device used for judging and controlling whether the fuel tank diagnosis device stops fuel leakage diagnosis according to the vehicle driving speed, the size relationship between the vehicle driving speed and a speed threshold V0 and the vehicle braking state data. The invention further relates to a method for avoiding fuel tank leakage misdiagnosis, fuel leakage diagnosis is carried out by the fuel tank diagnosis device through the vehicle speed sensor and the detection device, and when the vehicle driving speed is 0 or the vehicle driving speed is greater than V0, the controldevice controls the fuel tank diagnostic device to stop fuel leakage diagnosis, so that a misdiagnosis situation caused by shaking of the vehicle is avoided, and the user experience is improved.

Description

technical field [0001] The invention relates to the field of vehicle performance testing, in particular to a device and method for avoiding misdiagnosis of fuel tank leakage. Background technique [0002] According to the requirements of China VI regulations, the fuel tank system must be equipped with a fuel tank leakage diagnosis function to determine whether the fuel tank system is leaking. Certain conditions need to be met to start the fuel tank leak diagnostic program, one of which is the vehicle speed condition. When the vehicle speed>0 or a very small value, the fuel tank leakage diagnosis will be exited. However, when the vehicle speed condition is met and the system initiates fuel tank leakage diagnosis, false alarms will occur. Analyzing the reason, it is mainly because the moment the vehicle starts, the moment when it seems to be running, the vehicle shakes, causing the fuel in the fuel tank to shake, which further causes a large change in the pressure in the ...

AI Technical Summary

Problems solved by technology

However, when the vehicle speed condition is met and the system activates fuel tank leakage diagnosis, false alarms will occur.

Analyzing the reason, it is mainly because the moment the vehicle starts, the moment it seems to be running, the vehicle shakes, causing the fuel in the fuel tank to shake, which further causes a large change in the pressure in the fuel tank, causing the ongoing leak diagnosis program to mistakenly believe that the fuel tank system is faulty

[0003] When the system reports a fault, it will light a fault light on the dashboard to remind, but in fact, the system does not have any fault, but the driver will carry out maintenance based on this reminder, so the wrong fault reminder will cause the driver to panic dissatisfied

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