Diagnosis method, diagnosis terminal, vehicle and storage medium of low desorption pipeline

Abstract

The invention discloses a diagnosis method, a diagnosis terminal and a storage medium of a low-desorption pipeline. The method includes: obtaining the working parameters of the vehicle; judging whether the diagnosis boundary condition is satisfied according to the work parameter; when the diagnosis boundary condition is met, , control the solenoid valve on the low desorption pipeline to open with a preset opening value; obtain the voltage change value of the front oxygen sensor on the engine exhaust pipe before and after the solenoid valve is opened; judge whether the voltage change value of the front oxygen sensor is greater than or equal to the preset change threshold; if yes, it is determined that there is no fault in the low desorption pipeline; if not, it is determined that there is a fault in the low desorption pipeline. The invention solves the problem that the existing scheme of diagnosing the low desorption pipeline through the change of the intake manifold pressure when the carbon tank solenoid valve is opened is easily affected by other factors, resulting in a decrease in the accuracy of the diagnosis result.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a diagnostic method for a low desorption pipeline, a diagnostic terminal, a vehicle and a computer-readable storage medium. Background technique [0002] The low desorption pipeline system is a commonly used system on naturally aspirated engines. It can transmit the oil-air mixture absorbed by the carbon canister to the intake manifold to participate in the combustion in the cylinder to prevent the carbon canister from being damaged due to oil and gas saturation and the oil and gas Hazards such as leakage to the atmosphere occur, so the diagnosis of low-load desorption pipelines is particularly important. [0003] In the prior art, whether there is leakage in the low desorption pipeline is judged by the change of intake manifold pressure when the carbon canister solenoid valve is opened. In the actual driving process, many factors will cause the change of intake manifold pre...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose a diagnostic method, diagnostic terminal, vehicle, and computer-readable storage medium for low desorption pipelines, aiming at solving the problem of low diagnostic pressure of the intake manifold pressure when the carbon canister solenoid valve is opened. The scheme of the desorption pipeline is easily affected by other factors, resulting in a problem that the accuracy of the diagnostic results is reduced

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