Diagnosis of components used for leak detection in a vapor handling system
US6626032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2001 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Feb 1, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of diagnosing components used for leak detection in a closed vapor handling system of an automotive vehicle, implemented by a system, the method including providing leak detection components including a pressure switch that moves at a given relative vacuum, a control valve that operates to allow and prevent flow therethrough, and a shut off valve that operates to allow and prevent flow therethrough, running an engine, determining whether the pressure switch is closed, purging a canister, specifying a fail condition if the control valve is inoperative after purging, ascertaining whether the control valve is inoperative in a flow-through condition or inoperative in a non-flow-through condition if a fail condition is specified, specifying a pass condition if the control valve is functioning after purging, determining whether the shut off valve and pressure switch are malfunctioning if a pass condition is specified based on whether the pressure switch is open, and displaying an error if a component is malfunctioning. The system includes a pressure switch, a control valve, a shut off valve, and a processor operatively coupled to the pressure sensing element, the control valve, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.