Method and system for diagnosing a purge ejector
US9528473B2 · kind B2 · utility
18Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 2015 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Jul 20, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for diagnosing a purge path ejector used for purging fuel vapors from a canister under boosted engine conditions. The response of an exhaust gas sensor is monitored during each of vacuum purging of the canister and a subsequent boost purging of the canister, and compared to stoichiometry, to diagnose the ejector. By relying on changes in the exhaust air-fuel ratio incurred during purging, the coupling of the ejector to the compressor inlet may be diagnosed without the need for additional sensors or hardware.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.