Fuel vapor leak detection system
US5390645A · kind A · utility
64Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1994 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Mar 4, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0818
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Leakage from a portion of a canister purge system which includes a fuel tank and a vapor collection canister is detected by closing off that portion and then positively pressurizing it by means of an air pump. The air that is pumped by the air pump is split into two separate paths, one to pressurize the closed-off portion of the system, and the other to flow through a known orifice. A differential flow meter compares the flow through one path with that through the other to determine if there is leakage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.