Evaporative emission control system with vent valve
US5437257A · kind A · utility
44Cited by
20References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Feb 28, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0836
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An evaporative emission control system of an internal combustion engine's fuel system including a vent valve. The vent valve provides a mechanism for closing the evaporative emission control system creating a pressure differential between system and atmospheric under various conditions whereby the system can be automatically diagnosed. The vent valve relieves pressure or vacuum in the system that exceeds a threshold necessary to detect the presence of leaks. The vent valve includes a vacuum actuator providing a low restriction flow path for system purges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.