Air control valve assembly for fuel evaporative emission storage canister
US5878729A · kind A · utility
41Cited by
14References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1998 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | May 6, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K2015/03514
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air control valve assembly for the air side of an automotive fuel evaporative emission control system incorporates two passive check valves and an active blocking valve which cooperate to divide the air filtered air inlet path from the air exit path to atmosphere. The possibility of break through vapors flowing back into the air cleaner during canister vapor fill is avoided through the use of oppositely opening check valves. By adding an active blocking valve below the freely movable air inlet check valve, the canister can be rigorously sealed from the atmosphere during a diagnostic evacuation test.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.