Fuel system diagnostics
US9932937B2 · kind B2 · utility
3Cited by
11References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2012 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Oct 19, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0836
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and system are provided for distinguishing fuel tank vacuum generation due to canister purge valve degradation from vacuum generation due to canister vent valve degradation. A fuel tank vacuum level is monitored after sealing the fuel tank from the atmosphere following an engine pull-down. If there is an ensuing change in fuel tank vacuum, canister purge valve degradation is determined, else, canister vent valve degradation is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.