Leak detection a vapor handling system
US6658923B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2001 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Jun 15, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of leak detection in a closed vapor handling system of an automotive vehicle while an engine is running, implemented by a system, the method including providing a pressure sensing element that obtains at least one pressure signal, closing a control valve and a shut off valve to seal the system from the engine and an atmosphere, generating a vacuum by opening the control valve, analyzing the at least one pressure signal at threshold times, comparing the at least one pressure signal to at least one pressure control value, and determining a leak condition if the at least one pressure signal is not less than the at least one pressure control value. The system including a pressure sensing element, a control valve, a shut off valve, a processor operatively coupled to the pressure sensing element and the shut off valve and receiving pressure signals from the pressure sensing element and sending signals to the control valve and the shut off valve. The processor closes the control valve and the shut off valve, generates a vacuum, depressurizes the system using the vacuum, controls the vacuum by opening the control valve, analyzes the pressure signal at threshold times, compares the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.