Method of de-pressurizing an evaporative emission control system
US5685279A · kind A · utility
26Cited by
10References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Mar 5, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0818
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of de-pressurizing an evaporative emission control system includes the steps of pulsing a leak detection pump at a predetermined rate and purging accumulated vapors from a vapor canister. The method also includes the steps of determining whether a last pump period is greater than or equal to a predetermined system de-pressurization mode pump period and continuing the method if the last pump period is less than the system de-pressurization mode pump period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.