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Dynamic pressure correction in engine off natural vacuum system

一种发动机关闭、压力的技术，应用在蒸汽泄漏诊断系统领域，能够解决燃料箱快速压力变化、增加探测泄漏占用的时间、降低测试鲁棒性等问题

Active Publication Date: 2006-11-01
GENERAL MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other situations, however, events such as slamming the trunk, slamming a door, or shaking the vehicle can cause rapid pressure changes in the fuel tank
In this case, interrupting the leak detection test reduces the robustness of the test and increases the time taken to detect leaks

Method used

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  • Dynamic pressure correction in engine off natural vacuum system
  • Dynamic pressure correction in engine off natural vacuum system
  • Dynamic pressure correction in engine off natural vacuum system

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Embodiment Construction

[0015] The following description of preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application or uses. For purposes of clarity, the same reference numbers will be used to designate like elements in the various drawings. As used herein, the term "module" refers to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated or group) and memory, a combinational logic circuit that executes one or more software or firmware programs Or other suitable components that provide the described functionality.

[0016] Referring now to FIG. 1 , a vehicle 10 includes an engine 11 with a fuel system 12 . Fuel system 12 selectively supplies liquid and / or vapor fuel to engine 11 in a conventional manner. The control module 14 communicates with the engine 11 and the fuel system 12 . Although one control module 14 is shown, multiple control modules may be employed. The control module 14 m...

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Abstract

A leak detection system for a vehicle fuel tank includes a sensor that is responsive to a pressure within the fuel tank and that generates a pressure signal based thereon. A control module initiates an engine-off natural vacuum (EONV) test and determines a pressure change based on the pressure signal. The control module pauses the EONV test when the pressure change exceeds a pressure change threshold.

Description

technical field [0001] The present invention relates to a steam leak diagnostic system for use in a vehicle, and more particularly to dynamic pressure change detection and correction for a steam leak diagnostic system. Background technique [0002] Vehicles with internal combustion engines include fuel tanks that store liquid fuels such as gasoline, diesel, methanol or other fuels. The liquid fuel evaporates into fuel vapor, which increases the pressure in the fuel tank. Evaporation is caused by the energy transferred to the fuel tank. Energy sources include radiation (such as solar energy), convection, and conduction. An increase in vapor pressure in the fuel system may result in the rate at which vapor fuel is released into the atmosphere through leaks in the fuel system. The vapor leak diagnostic system attempts to diagnose a vapor fuel leak condition. [0003] Typically, a steam leak detection system is shut down when a sudden pressure spike is detected. In some cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08G01M3/26
CPCF02M25/0809G01M3/025
Inventor K·D·麦克莱恩M·J·皮特施
Owner GENERAL MOTORS CORP