Purge valve leak diagnostic systems and methods
US8122758B2 · kind B2 · utility
5Cited by
11References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2009 |
| Grant date | Feb 28, 2012 |
| Priority date | — |
| Expiry date | Jul 15, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A leak diagnostic system for a vehicle comprises a tank pressure module and a leak diagnostic module. The tank pressure module selectively outputs first and second fuel tank pressures when an engine is shut down and when engine vacuum is greater than a predetermined engine vacuum, respectively. The leak diagnostic module selectively diagnoses a leak in a fuel vapor purge valve based on the second fuel tank pressure when the first fuel tank pressure is less than a first predetermined pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.