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Evaporation system leak diagnosis method

A technology of evaporation system and diagnostic method, which is applied in the direction of charging system, engine components, combustion engine, etc., can solve the problems of abnormal fluctuation of vacuum degree attenuation, large change of vacuum degree, and inaccurate diagnosis, so as to eliminate the influence and make accurate judgment , to avoid the effect of affecting

Active Publication Date: 2022-07-05
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Failure to consider the influence of relevant factors on the vacuum degree will lead to inaccurate diagnosis
For example, the reduction of the vacuum degree may be due to the large change of the vacuum degree due to the generation of oil vapor, or the abnormal fluctuation of the vacuum degree attenuation due to the external force on the fuel tank, which affects the judgment

Method used

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  • Evaporation system leak diagnosis method
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Embodiment Construction

[0042] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the disclosure, its application or uses in any way. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that unless specifically stated otherwise, the relative arrangements of parts and steps, compositions of materials, numerical expressions and numerical values ​​set forth in these embodiments are to be interpreted as illustrative only and not as limiting.

[0043] As used in this disclosure, "first", "second": and similar terms do not denote any order, quantity, or importance, but are merely used to ...

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Abstract

The invention discloses a method for diagnosing leakage of an evaporation system, which includes: performing fault detection on relevant components; judging whether the relevant diagnosis conditions are met; when the relevant components are normal and the relevant diagnosis conditions are met, closing a carbon canister solenoid valve and a carbon canister ventilation valve ; Monitor whether the oil vapor generation rate in the fuel tank is less than the preset value, if not, do not diagnose; if so, judge whether the evaporation system leaks through the vacuum degree decay test. The method for diagnosing the leakage of the evaporation system of the present invention avoids the influence of the oil vapor and misjudgment by monitoring the oil vapor in the oil tank; and can effectively monitor the gas leakage of the evaporation system by accurately judging the attenuation of the vacuum degree of the oil tank. tightness, avoid the influence of external factors on the vacuum degree, and avoid misjudgment.

Description

technical field [0001] The invention relates to the technical field of fuel vehicles, in particular to a method for diagnosing leakage of an evaporation system. Background technique [0002] With the development and progress of society, the country pays more and more attention to the environment. As a carrier of traditional energy, the impact of automobiles on the atmosphere has attracted more and more attention. China VI regulations require the OBD (On-Board Diagnostic System, On-Board Diagnostic System) system to monitor the air tightness of the evaporation system to prevent fuel leakage into the atmosphere. Therefore, when there is leakage in the pipeline of the evaporation system, it should be accurately judged. [0003] At present, the monitoring and diagnosis of the leakage of the fuel pipeline in the evaporation system is to establish a vacuum pressure, and then monitor the attenuation of the vacuum pressure in the closed space. If the attenuation is large within a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/22F02D41/00F02M25/08
CPCF02M25/0809F02D41/004Y02T10/40
Inventor 李凯迟佳男刘发明温敏徐洪伟侯金
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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