Diagnostic method and device for fuel leakage and fuel tank system

Abstract

The invention discloses a diagnostic method and device for fuel leakage and a fuel tank system. The diagnostic method and device are used for detecting whether fuel leakage occurs to the fuel tank system or not. The fuel tank system comprises a fuel tank and a sensing part. The fuel tank system is sequentially connected with a mechanical part and an air filtrator through pipelines. The method comprises the steps that information, detected by the sensing part, of the temperatures of the fuel tank and the environment is received, and when the temperature difference value between the temperature of the fuel tank and the temperature of the environment is within a preset temperature difference value range, a control signal is sent to the mechanical part to disconnect the mechanical part and the air filtrator, so that the fuel tank system forms a sealed cavity; and within the preset time, the variable quantities of the temperature and the pressure of the fuel tank in the sealed cavity are measured and are compared with the target variable quantities of the temperature and the pressure, and when the compared results are different, the condition that fuel leakage occurs to the fuel tank system is determined. According to the diagnostic method and device for fuel leakage and the fuel tank system, the problem that whether fuel leakage occurs to the fuel tank or not cannot be detected through an existing method and device is solved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a fuel leakage diagnosis method, device and fuel tank system. Background technique [0002] With the improvement of living standards, more and more people travel by driving a car. Most of the existing cars use fuel to provide the energy for driving, and the process of driving a car requires frequent filling of the fuel tank. gasoline. [0003] However, because the gasoline in the fuel tank is a volatile liquid, it is usually full of gasoline vapor in the fuel tank at normal temperature. Volatilizes into the atmosphere, usually using an on-board refueling oil vapor recovery device (ORVR), that is, a carbon canister is installed between the engine and the fuel tank, and activated carbon is installed in the carbon canister. The activated carbon has an adsorption function to absorb gasoline vapor, and the fuel tank and carbon The canister is connected, gasoline vapor can enter ...

AI Technical Summary

Problems solved by technology

[0005] Based on this, the embodiment of the present invention proposes a fuel leakage diagnosis method, device and fuel tank system to solve the existing problem of not being able to detect whether the fuel tank is leaking

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