Method and system for fuel vapor control
US9026345B2 · kind B2 · utility
8Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2012 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Aug 16, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0818
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for performing a vehicle-off fuel system leak test. A vehicle controller may be woken up after a vehicle has been in a key-off condition for a sufficient amount of time to monitor a fuel tank for pressure and temperature stabilization. If the pressure and temperature of the fuel tank is stable, a fuel pump may be operated to raise a fuel tank vapor pressure, and fuel system leaks are identified based on a rate of pressure decay from the fuel tank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.