Restricted filter diagnostic system and method
US8327695B2 · kind B2 · utility
12Cited by
4References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2010 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Apr 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A restriction diagnostic system for a vehicle comprises a pressure difference module and a diagnostic module. The pressure difference module determines a pressure difference between an ambient air pressure and a filtered air pressure measured at a location between an air filter and a valve that is selectively opened to enable ambient airflow through the air filter to a fuel vapor canister. The diagnostic module selectively diagnoses restriction of the airflow through the air filter when the pressure difference is greater than a predetermined pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.