Purge vapor start feature
US6318345A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1999 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Aug 19, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/0042
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel control system is provided including a fuel tank and a purge vapor collection canister interconnected with an internal combustion engine. A purge vapor canister vent valve selectively seals the purge vapor canister from atmosphere such that the fuel tank, purge vapor canister, and engine intake manifold form a closed system. Upon a cold engine start, a purge valve disposed between the purge vapor canister and the engine intake manifold is opened such that the pressure differential between the engine intake manifold and the remainder of the system causes fuel vapor collected within the dome portion of the fuel tank to be drawn through the purge vapor canister and into the intake manifold. Simultaneously therewith, the amount of fuel injected by the fuel injectors to the engine is reduced such that a desired amount of total fuel delivery is established. As the pressure differential between the intake manifold and the remainder of the closed system changes over time, flow rate of purge vapors from the fuel tank slows down. Commensurate therewith, the amount of injected fuel is increased. During this time the engine is warming up such that the increased amount of injected fuel i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.