Evaporative emission canister purge actuation monitoring system
US7431022B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2007 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Jul 24, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/089
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An evaporative emission canister purge actuation monitoring system includes an integrated valve body having a main flow passage, a first one-way umbrella valve mounted to the valve body that is responsive to predetermined positive pressure in the main flow passage to control flow of fluid from a vapor canister to ambient air as well as a second one-way umbrella valve that is responsive to a predetermined negative pressure in the main flow passage to control the flow of ambient air through a fresh air port. A vacuum actuated switch is supported by the integrated valve body and in electrical communication with a control unit. The switch is responsive to negative pressure in the main flow passage to send a signal indicative of the predetermined negative pressure to the control unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.