Leak detection assembly
US5495749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1995 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Jul 10, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0818
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A leak detection assembly for an evaporative emission control system in an automotive vehicle including a fuel tank, a canister for collecting volatile fuel vapors from the fuel tank, a purge valve disposed between the canister and an intake manifold of an engine operative to allow flow of the fuel vapors from the canister to the intake manifold, a vacuum actuated pump in communication with the canister, and a vent control valve operative to selectively allow and prevent communication between the canister and an atmospheric vent of the vacuum actuated pump, the leak detection assembly including a three-port solenoid fluidly connected to the intake manifold and a second atmospheric vent, and a vacuum line fluidly connecting the three-port solenoid to the vent control valve, the three-port solenoid selectively communicating with the intake manifold to allow a vacuum in the vacuum line during a first operating mode to close the vent control valve and selectively communicating with the second atmospheric vent during a second operating mode to open the vent control valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.